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Encyclopedia > List of gaps in Interstate Highways

For the most part, the Interstate Highway System in the United States is a connected system, with most roads completed. However, some Interstates still have gaps. Image File history File links I-blank. ... The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly called the Interstate Highway System, is a network of highways (also called expressways) in the United States. ...

Contents

True gaps

True gaps are where two sections of road are intended to be part of the same Interstate, but the two sections are not physically connected, or are only connected by non-Interstates, or are connected but the connection is not signed as part of the highway.

  • I-69 has two sections; the original alignment runs from Indianapolis, Indiana to Port Huron, Michigan. On October 2, 2006, a segment of I-69 opened in Tunica and DeSoto Counties in Mississippi; these segments will eventually be connected as I-69 is extended across the United States.
  • I-74 currently has three sections, one heading west from Cincinnati, Ohio, one from the Virginia/North Carolina state line along I-77 south and east to a point southeast of Mount Airy, North Carolina, and one concurrent with the only section of I-73, from Emery, North Carolina to Ulah, North Carolina. Other sections up to freeway standards are signed with I-74 shields that have FUTURE instead of INTERSTATE. Future I-73 shields are also placed along some of these sections, but only one section of I-73 is signed with normal Interstate shields.
  • I-95. Probably the best-known and notoriously confusing of all the Interstate gaps, I-95 is discontinuous in Lawrence Township, New Jersey (near Trenton). Coming north from Philadelphia, Pennsylvania, I-95 loops around the north side of Trenton and ends at U.S. Route 1, where it becomes I-295, which heads back south. The other section of I-95 begins on the Pennsylvania Turnpike at the Pennsylvania/New Jersey state line, and heads north along the New Jersey Turnpike. Originally I-95 was planned to have left the alignment north of Trenton and headed northeast to I-287 and run east along I-287 to Exit 10 on the Turnpike, but this "Somerset Freeway" was never built. Extensions over the years have taken I-95 several miles further north to the US 1 interchange northeast of Trenton, and south along the New Jersey Turnpike to the Pennsylvania state line. Eventually an interchange will be built connecting the southern alignment with the Pennsylvania Turnpike, and I-95 will be rerouted via it, with the part north of that interchange becoming an extension of I-195 (it was originally considered as an extension of I-295).
  • Interstate 93 in New Hampshire is also divided into 2 parts. Between exits 33 and 35 is a Super Two, a two-lane road that is usually meant to connect different interstates. The super-two is located in Franconia Notch and is known as the Franconia Notch Parkway.

Interstate 69 just outside Indianapolis near Fortville, Indiana Interstate 69 (abbreviated I-69) is an interstate highway in the Southern and Midwestern United States. ... Location in the state of Indiana Coordinates: County Marion Founded 1821 Government  - Mayor Bart Peterson (D) Area  - City  372 sq mi (963. ... Port Huron is a city in the U.S. state of Michigan. ... Tunica County is a county located in the state of Mississippi. ... DeSoto County is a county located in the U.S. state of Mississippi. ... This article does not cite any references or sources. ... Interstate 74 (abbreviated I-74) is an interstate highway in the Midwestern and southeastern United States. ... This article or section does not cite any references or sources. ... Official language(s) English Capital Richmond Largest city Virginia Beach Area  Ranked 35th  - Total 42,793 sq mi (110,862 km²)  - Width 200 miles (320 km)  - Length 430 miles (690 km)  - % water 7. ... Official language(s) English Capital Raleigh Largest city Charlotte Area  Ranked 28th  - Total 53,865 sq mi (139,509 km²)  - Width 150 miles (240 km)  - Length 560[1] miles (901 km)  - % water 9. ... Interstate 77 (abbreviated I-77) is an interstate highway in the eastern United States. ... Mount Airy is a city located in Surry County, North Carolina, USA. As of the 2000 census, the city had a total population of 8,484. ... Interstate 73 (abbreviated I-73) is a main route of the Interstate Highway System, currently located entirely within the U.S. state of North Carolina. ... Wikimedia Commons has media related to: Interstate 95 Interstate 95 (abbreviated I-95) is a well-known, important, and heavily traveled highway in the United States Interstate Highway System. ... Wikimedia Commons has media related to: Interstate 95 Interstate 95 (abbreviated I-95) is a well-known, important, and heavily traveled highway in the United States Interstate Highway System. ... Lawrence Township highlighted in Mercer County. ... Nickname: Trent, T-Town Location of Trenton inside of Mercer County Coordinates: Country United States State New Jersey County Mercer County Founded circa 1719 Mayor Douglas H. Palmer Area    - City 21. ... Nickname: City of Brotherly Love, Philly, the Quaker City Motto: Philadelphia maneto (Let brotherly love continue) Location in Pennsylvania Coordinates: Country United States State Pennsylvania County Philadelphia Founded October 27, 1682 Incorporated October 25, 1701 Mayor John F. Street (D) Area    - City 369. ... This U.S. Highway article needs to be cleaned up to conform to both a higher standard of article quality and accepted design standards outlined in the WikiProject U.S. Highways. ... Interstate 295 (abbreviated I-295) in New Jersey and Delaware is a bypass route from a junction with Interstate 95 south of Wilmington, Delaware to a junction with I-95 north of Trenton, New Jersey. ... This Pennsylvania state route article needs to be cleaned up to conform to both a higher standard of article quality and accepted design standards outlined in the WikiProject Pennsylvania State Highways. ... Capital Harrisburg Largest city Philadelphia Area  Ranked 33rd  - Total 46,055 sq mi (119,283 km²)  - Width 280 miles (455 km)  - Length 160 miles (255 km)  - % water 2. ... It has been suggested that this article be split into multiple articles. ... The New Jersey Turnpike is a toll road in New Jersey and is one of the most heavily traveled highways in the United States. ... 287 Sign Interstate 287 (abbreviated I-287) is a major interstate highway in New Jersey and New York. ... The Somerset Freeway is the planning name for an unbuilt section of Interstate 95 in central New Jersey. ... The Pennsylvania Turnpike/Interstate 95 Interchange Project is a project to build an interchange where Interstate 95 crosses the Pennsylvania Turnpike in Bristol Township, Pennsylvania. ... Interstate 195 (abbreviated I-195) begins at Route 34 in Wall Township and ends at I-295 just south of Trenton, New Jersey. ...

Disputed gaps

  • I-90 at the Chicago Skyway — Historically the Skyway was commonly considered to be, and was signed as, part of I-90 (originally I-94). However, around 1999 the City of Chicago, Illinois determined it may never have applied for approval to sign it as an Interstate. (It also is not designed to Interstate standards.) The city re-signed the Skyway, and it is now mostly posted with "TO I-90" signs, with a few older signs remaining. However, the Illinois Department of Transportation has always and continues to report the Skyway as part of the Interstate system, and the Federal Highway Administration still considers it as such. A FHWA legal memo says "There is no doubt about it. The Chicago Skyway is officially part of I-90 that (has) always been included in the Dwight D. Eisenhower National System of Interstate and Defense Highways."[1][2]
  • I-265. The Indiana portion of I-265 does not yet connect with the Kentucky portion of I-265. Each of the two segments, circling the outskirts and suburbs of Louisville, Kentucky, ends before crossing the Ohio River. Plans for constructing a bridge to connect the two segments have been finalized, though the project is far from complete.[3] It is not technically a gap as both parts are in two different states and can be considered 'separate' freeways.

Wikimedia Commons has media related to: Interstate 90 Interstate 90 (abbreviated I-90) is the longest interstate highway in the United States at nearly 3,100 miles (5,000 kilometers). ... The Chicago Skyway also known as Chicago Skyway Toll Bridge System is a 7. ... Interstate 94 (abbreviated I-94) is a long interstate highway connecting the Great Lakes and Intermountain region of the United States. ... 1999 (MCMXCIX) was a common year starting on Friday, and was designated the International Year of Older Persons by the United Nations. ... Flag Seal Nickname: The Windy City Motto: Urbs In Horto (Latin: City in a Garden), I Will Location Location in Chicagoland and northern Illinois Coordinates , Government Country State Counties United States Illinois Cook, DuPage Mayor Richard M. Daley (D) Geographical characteristics Area     City 606. ... The Federal Highway Administration (FHWA) is a division of the United States Department of Transportation that specializes in highway transportation. ... Interstate 265 (abbreviated I-265) is an Interstate Highway ringing the Louisville, Kentucky metropolitan area, which includes southern Indiana, although the Indiana and Kentucky segments remain separate at the present time. ... Official language(s) English Capital Indianapolis Largest city Indianapolis Area  Ranked 38th  - Total 36,418 sq mi (94,321 km²)  - Width 140 miles (225 km)  - Length 270 miles (435 km)  - % water 1. ... Official language(s) English[1] Capital Frankfort Largest city Louisville Area  Ranked 37th  - Total 40,444 sq mi (104,749 km²)  - Width 140 miles (225 km)  - Length 379 miles (610 km)  - % water 1. ... “Louisville” redirects here. ... Cincinnati, Ohio is a well known city along the Ohio River, historically known for its riverboats. ... The Ohio River Bridges Project is a Louisville metropolitan area transportation infrastructure construction project involving the reconstruction of the Kennedy Interchange (locally known as Spaghetti Junction), the completion of two new Ohio River bridges and the reconstruction of ramps on I-65 between I-264 and downtown. ...

Freeway gaps

Freeway gaps, where the Interstate is signed as a continuous route, but part or all of it is not up to freeway standards. This includes drawbridges where traffic on the Interstate can be stopped for vessels. This does not include facilities such as tollbooths or toll plazas, agricultural inspection stations (as found in California), or border stations. Interstate 80 (Eastshore Freeway) in Berkeley, a typical American freeway (MUTCD definition) A freeway is a type of highway that is designed for safer high-speed operation of motor vehicles through the elimination of at-grade intersections. ... A drawbridge is a type of movable bridge typically associated with the entrance of a castle, but the term is also used to describe modern bascule bridges and lift bridges. ... This article or section does not cite any references or sources. ... Official language(s) English Capital Sacramento Largest city Los Angeles Area  Ranked 3rd  - Total 158,302 sq mi (410,000 km²)  - Width 250 miles (400 km)  - Length 770 miles (1,240 km)  - % water 4. ...


At-grade intersections and traffic lights

  • Several Interstates in the southwest U.S. have at-grade intersections (including median breaks) with minor farm access roads. This is usually due to the lack of an old highway, and the need to provide access to property that was accessed via the road prior to upgrade to Interstate, and the high cost to construct an interchange for the small amount of traffic that use such a connection or build a frontage road parallel to the freeway to the nearest interchange. For instance, I-40 in both the western Texas Panhandle and western North Carolina has several driveways intersecting directly with the road, and such intersections can be spotted in rural segments of I-5, particularly in southwestern Washington and central California.
  • I-70 uses part of US 30 along a surface road in Breezewood, Pennsylvania to get between the freeway heading south to Hancock, Maryland and the ramp to the Pennsylvania Turnpike. This is probably the best-known instance of traffic lights on an interstate. There used to be a sign of a policeman pointing at drivers leaving the Pennsylvania Turnpike to enter US 30, saying, "You! Slow Down!" Local businesses have lobbied to keep the gap to avoid loss of business.[4] [5] Photos of Eastbound I-70 with traffic lights: [6] [7] from [8]
  • I-78 travels along a one-way pair of surface streets, 12th Street and 14th Street, in Jersey City, New Jersey, between the end of the New Jersey Turnpike Newark Bay Extension and the Holland Tunnel which leads into New York, New York. Along with the aforementioned I-70, this is the only other primary interstate with traffic lights (which exist on both the ends of the tunnel). [9] Photos of traffic lights in I-78: [10], [11] from [12]
  • I-180 in Cheyenne, Wyoming has no parts built to freeway standards; in fact the interchange with I-80 is even a simple diamond interchange with two traffic lights on I-180, however it is expressway-quality with a few grade-separations. [13] [14]
  • I-585 in Spartanburg, South Carolina is cosigned with US 176, in which I-585 shields are present in beyond the point where it ceases to be a freeway, having passed through traffic lights. There also exists a sign that marks the road there as "I-585 Business Spur" and hence it is unclear whether that surface section of US 176 also belongs to I-585.
  • I-676 has a surface street section at the west end of the Ben Franklin Bridge in Philadelphia, Pennsylvania because of historically significant areas. Signage and the Federal Highway Administration consider I-676 to use the surface streets, but the Pennsylvania Department of Transportation may consider I-676 to stay on the freeway to end at I-95, with the surface streets and the bridge being only US 30, and the part in New Jersey being a different I-676.[15]
  • I-690 in Syracuse, New York has a traffic light for twelve days each year, for buses to carry Great New York State Fair attendees from parking areas across the road to the fair.

An at-grade intersection is a junction at which two or more transport axes cross at the same level (or grade). ... A frontage road for U.S. Highway 71 (a freeway) near Carthage, Missouri. ... Interstate 40 (abbreviated I-40) is a major west-east interstate highway in the United States. ... The Texas Panhandle is a region of the state of Texas consisting of the northernmost 26 counties in the state. ... Official language(s) English Capital Raleigh Largest city Charlotte Area  Ranked 28th  - Total 53,865 sq mi (139,509 km²)  - Width 150 miles (240 km)  - Length 560[1] miles (901 km)  - % water 9. ... Interstate 70 (abbreviated I-70) is a long interstate highway in the United States that runs from Interstate 15 about a mile from Cove Fort, Utah to a Park and Ride in Baltimore, Maryland. ... United States Highway 30 is an east-west United States highway that traverses the United States. ... The end of I-70, with a gauntlet of gas/food/motels to be run before reaching the Pennsylvania Turnpike. ... Hancock is a town located in Washington County, Maryland. ... This Pennsylvania state route article needs to be cleaned up to conform to both a higher standard of article quality and accepted design standards outlined in the WikiProject Pennsylvania State Highways. ... Traffic lights can have several additional lights for filter turns or bus lanes. ... This Pennsylvania state route article needs to be cleaned up to conform to both a higher standard of article quality and accepted design standards outlined in the WikiProject Pennsylvania State Highways. ... This Interstate Highway article needs to be cleaned up to conform to both a higher standard of article quality and accepted design standards outlined in the WikiProject U.S. Interstate Highways. ... A one-way pair is a pair of parallel, usually one-way streets that carry opposite directions of a signed route or major traffic flow. ... Location of Jersey City within New Jersey. ... The New Jersey Turnpike is a toll road in New Jersey and is one of the most heavily traveled highways in the United States. ... Clifford Milburn Holland, 1919 Traveling through the Holland Tunnel, from Manhattan to New Jersey. ... Midtown Manhattan, looking north from the Empire State Building, 2005 New York City (officially named the City of New York) is the most populous city in the state of New York and the entire United States. ... Interstate 180 is the designation for three tertiary interstate routes in the United States; additionally, a fourth route in Wyoming is signed as Interstate 180 as it received federal funds, but none of its length is interstate grade. ... Location in Wyoming Coordinates: County Laramie County Founded 1867 Government  - Mayor Jack R. Spiker Area  - City 57. ... Interstate 80 (Eastshore Freeway) in Berkeley, a typical American freeway (MUTCD definition) A freeway is a type of highway that is designed for safer high-speed operation of motor vehicles through the elimination of at-grade intersections. ... Interstate 80 (abbreviated I-80) is the second-longest Interstate Highway in the United States. ... A typical diamond interchange A diamond interchange is a common type of road junction. ... A typical expressway in Santa Clara County, California. ... Interstate 585 (abbreviated I-585) stretches from an Interstate 85 Business loop to Spartanburg, South Carolina. ... U.S. Highway 176 is a spur of U.S. Highway 76. ... Interstate 676 (abbreviated I-676) is an interstate highway that serves as a major thoroughfare through Philadelphia, Pennsylvania and Camden, New Jersey. ... Categories: US geography stubs | Buildings and structures stubs | Toll bridges in New Jersey | Toll bridges in Pennsylvania | Suspension bridges ... Nickname: City of Brotherly Love, Philly, the Quaker City Motto: Philadelphia maneto (Let brotherly love continue) Location in Pennsylvania Coordinates: Country United States State Pennsylvania County Philadelphia Founded October 27, 1682 Incorporated October 25, 1701 Mayor John F. Street (D) Area    - City 369. ... The Federal Highway Administration (FHWA) is a division of the United States Department of Transportation that specializes in highway transportation. ... The Pennsylvania Department of Transporation (or PennDOT) oversees transportation issues in the Commonwealth of Pennsylvania. ... Wikimedia Commons has media related to: Interstate 95 Interstate 95 (abbreviated I-95) is a well-known, important, and heavily traveled highway in the United States Interstate Highway System. ... United States Highway 30 is an east-west United States highway that traverses the United States. ... It has been suggested that this article be split into multiple articles. ... The never fully-utilized intersection of Interstate 481 and Interstate 690 in East Syracuse. ... Nickname: The Salt City Location of Syracuse within the state of New York Coordinates: City Government  - Mayor Matthew Driscoll Area  - City 66. ... The Great New York State Fair is an annual farmers exposition and a showcase of entertainment, education, industry, and technology sponsored by the State of New York. ...

Undivided freeways

This section addresses two-lane freeways and other undivided freeway sections of the Interstate, excepting instances of continuing routes using one-lane ramps. A two-lane freeway or two-lane expressway is a freeway or expressway with only one lane in each direction, and usually no median barrier. ...

  • I-93 is a two-lane, divided parkway through Franconia Notch in New Hampshire. A four-lane interstate was proposed, but was abandoned due to environmental concerns, in part related to vibrations which could harm the Old Man of the Mountain. (The Old Man collapsed anyway in 2003.) The section was, for many years, signed as US 3 and "To 93" but has since been replaced with I-93 shields.

This Interstate Highway article needs to be cleaned up to conform to both a higher standard of article quality and accepted design standards outlined in the WikiProject U.S. Interstate Highways. ... Franconia Notch State Park is located in the White Mountains in northern New Hampshire and straddles 8 miles of Interstate 93 as it passes between the Kinsman Range and Franconia Range. ... The Old Man of the Mountain, also known as the great stone face, was a series of five granite cliff ledges on Cannon Mountain in the White Mountains of New Hampshire, USA that, when viewed from the correct angle, appeared to be the jagged profile of a face. ... U.S. Route 3 is a north-south United States highway that runs from its southern terminus in Cambridge, MA (the official end according to AASHTO is at US 20 across the Charles River in Boston, though current signs indicate a terminus in Cambridge at Route 2A/3) through New...

Drawbridges

Interstate 5 (abbreviated I-5) is the westernmost interstate highway in the continental United States. ... The Columbia River (French: fleuve Columbia) is a river in the Pacific Northwest region of North America. ... Nickname: Location in Multnomah County and the state of Oregon Coordinates: Country United States State Oregon County Multnomah County Incorporated February 8, 1851 Government  - Mayor Tom Potter Area  - City  145. ... Nickname: Vancouver USA, The Couve Motto: A colorful past, a bright future Location in Washington Coordinates: Country United States State Washington County Clark County Founded 1825 Incorporated 1857 Government  - Mayor Royce Pollard Area  - City  46. ... The Interstate Bridge is a pair of identical steel through truss bridges with a vertical lift that carries Interstate 5 traffic over the Columbia River between Vancouver, Washington and Portland, Oregon. ... Metropolitan Area Express (MAX) is a light rail system in the Portland, Oregon metropolitan area. ... Wikimedia Commons has media related to: Interstate 64 Interstate 64 (abbreviated I-64) is an Interstate Highway in the eastern United States. ... A map of the Hampton Roads Beltway (from the Virginia Department of Transportation) Hampton Roads Beltway is a loop of Interstate 64 and Interstate 664 highways which link the communities of the Virginia Peninsula and South Hampton Roads which surround the body of water known as Hampton Roads in the... The Elizabeth River is a short tidal estuary forming an arm of Hampton Roads at the southern end of Chesapeake Bay in southeast Virginia in the United States. ... Location in the State of Virginia Coordinates: Country United States State Virginia County Independent city Founded 1963 Government  - Mayor Dalton S. Edge Area  - City  350. ... High Rise Bridge is a bascule drawbridge which carries a portion of the Hampton Roads Beltway designated as Interstate 64 across the Southern Branch of the Elizabeth River in Chesapeake, Virginia. ... Wikimedia Commons has media related to: Interstate 95 Interstate 95 (abbreviated I-95) is a well-known, important, and heavily traveled highway in the United States Interstate Highway System. ... The Capital Beltway (in green) Interstate 495 (abbreviated I-495) is a freeway-class interstate highway which circles Washington, D.C. and its inner suburbs in Maryland and Virginia. ... The Capital Beltway (in green) The Capital Beltway (Interstate 495) is an expressway-class interstate highway which circles the Washington, DC area. ... The Potomac River flows into the Chesapeake Bay, located along the mid-Atlantic coast of the United States (USA). ... Interstate 95 (District of Columbia) redirects here. ... Nickname: Motto: Justitia Omnibus (Justice for All) Location of Washington, D.C., in relation to the states Maryland and Virginia Coordinates: Country United States Federal District District of Columbia Government  - Mayor Adrian M. Fenty (D)  - City Council Chairperson: Vincent C. Gray (D) Ward 1: Jim Graham (D) Ward 2: Jack... Wikimedia Commons has media related to: Interstate 95 Interstate 95 (abbreviated I-95) is a well-known, important, and heavily traveled highway in the United States Interstate Highway System. ... Nickname: Location in the state of New York Coordinates: Country United States State New York Boroughs The Bronx Brooklyn Manhattan Queens Staten Island Settled 1625 Government  - Mayor Michael Bloomberg (R) Area  - City  468. ... Interstate 110 (abbreviated I-110) is a 4. ... Biloxi Lighthouse (of 1848) Biloxi () is a city in Harrison County, Mississippi, in the U.S.. The 2000 census recorded the population as 50,644. ... Interstate 264 (abbreviated I-264) is an unusual 3-digit interstate that contains both a bypass and a spur off Interstate 64 in the Hampton Roads area of Virginia. ... The Berkley Bridge on Interstate 264 crosses the Eastern Branch of the Elizabeth River in the independent city of Norfolk, Virginia in the South Hampton Roads area. ... The Elizabeth River is a short tidal estuary forming an arm of Hampton Roads at the southern end of Chesapeake Bay in southeast Virginia in the United States. ... Motto: Crescas (Latin for, Thou shalt grow. ... Interstate 278 (abbreviated I-278) is an Interstate Highway in the U.S. states of New Jersey and New York. ... Bronx River in Westchester County, NY The Bronx River is a river, approximately 24 mi (38 km) long, in southeast New York in the United States. ... Midtown Manhattan, looking north from the Empire State Building, 2005 New York City (officially named the City of New York) is the most populous city in the state of New York and the entire United States. ... Interstate 280 is the name of four distinct spur routes of Interstate 80 in the United States. ... The William A. Stickel Memorial Bridge is a vertical lift bridge in New Jersey that crosses the Passaic River, connecting Newark and Harrison as part of Interstate 280. ... The Great Falls of the Passaic River in Paterson, New Jersey The Passaic River is a tributary of Newark Bay, approximately 80 mi (129 km long), in northern New Jersey in the United States. ... Nickname: Map of Newark in Essex County County Essex Founded/Incorporated 1666/1836 Government  - Mayor Cory Booker, term of office 2006–2010 Area [1]  - City 67. ... Harrison is a town in Hudson County, New Jersey, United States. ... Interstate 280 is the name of four distinct spur routes of Interstate 80 in the United States. ... The Maumee River at Grand Rapids, Ohio. ... Nickname: Location in the state of Ohio Coordinates: Country United States State Ohio County Lucas Founded 1833 Government  - Mayor Carty Finkbeiner (D) Area  - City 84. ... The Maumee River Crossing, officially known as the Veterans Glass City Skyway, is a cable-stayed bridge currently under construction on Interstate 280 in Toledo, Ohio. ... Interstate 395 in Virginia is a 13 mile long spur route that begins at a junction with Interstate 95 in Springfield, Virginia and ends in downtown Washington, District of Columbia. ... The Potomac River flows into the Chesapeake Bay, located along the mid-Atlantic coast of the United States (USA). ... (Redirected from 14th Street Bridge) The 14th Street Bridge carries Interstate 395 and U.S. Highway 1 traffic across the Potomac River, connecting Arlington, Virginia and Washington DC. The bridge is also known for being the location of the Air Florida Flight 90 airplane crash on January 13, 1982. ... Nickname: Motto: Justitia Omnibus (Justice for All) Location of Washington, D.C., in relation to the states Maryland and Virginia Coordinates: Country United States Federal District District of Columbia Government  - Mayor Adrian M. Fenty (D)  - City Council Chairperson: Vincent C. Gray (D) Ward 1: Jim Graham (D) Ward 2: Jack... Interstate 695 (abbreviated I-695) is a 51. ... The Baltimore Beltway, Interstate 695, is a full beltway interstate highway extending around Baltimore, Maryland. ... Nickname: Motto: The Greatest City in America,[4] Get in on it. ... The Francis Scott Key Bridge, also known as the Outer Harbor Bridge, is a continuous truss bridge spanning the Patapsco River in Maryland, USA. The bridge was opened in March 1977 and is named for the author of the Star Spangled Banner, Francis Scott Key. ...

Connection gaps

Auxiliary Interstates (also known to as 3-digit Interstates) are supposed to connect to their parent either directly or via a same-parented Interstate (like I-280 in California being connected to I-80 via I-680). Those 3-digit Interstates that start with an even number are supposed to be bypasses, and thus are supposed to connect to the parent at both ends. 3-digit Interstates starting with an odd number are spur routes and usually only connect to the parent at one end. Those that don't conform to these standards can be said to have a connection gap: This is a list of auxiliary (three-digit) Interstate Highway designations in the United States. ... This is a list of auxiliary (three-digit) Interstate Highway designations in the United States. ... A view of the scenic portion of Interstate 280 Interstate 280 (abbreviated I-280) is a 57-mile-long interstate highway in the San Francisco Bay Area metropolitan area of Northern California. ... Interstate 80 (abbreviated I-80) is the second-longest Interstate Highway in the United States. ... JUNCTION POSTMILE I-280 SCL 0. ...

This California State Highway article needs to be cleaned up to conform to both a higher standard of article quality and accepted design standards outlined in the WikiProject California State Highways. ... Interstate 10 (abbreviated I-10) is the southernmost east-west, coast-to-coast interstate highway in the United States. ... JUNCTION POSTMILE I-210 LA ?? SR-71 LA ?? I-10 LA ?? SR-60 LA ?? SR-90 OC ?? SR-91 OC ?? I-5 OC ?? Legend Prev Next < Route 56 Route 58 > California State Highways Current - Unconstructed - Deleted - Scenic California State Route 57 is the Orange Freeway, a major north-south freeway... JUNCTION POSTMILE I-210 /SR-57 LA R44. ... 2008 (MMVIII) will be a leap year starting on Tuesday of the Gregorian calendar. ... Interstate 210, highlighted in red. ... Interstate 238 (abbreviated I-238) is a short (2. ... Alameda County is a suburban county in Californias San Francisco Bay Area. ... Interstate 80 (abbreviated I-80) is the second-longest Interstate Highway in the United States. ... Interstate 580 (abbreviated I-580) in Northern California is a heavily traveled, fairly long spur route of Interstate 80 that connects the San Francisco Bay Area to Interstate 5 in the states Central Valley. ... Interstate 880 (abbreviated I-880) is an interstate highway in the San Francisco Bay Area. ... JUNCTION POSTMILE I-238 / I-580 ?? CA-185 / CA-92 ?? CA-84 ?? I-680 ?? Legend Prev Next < Route 237 Route 239 > California State Highways Current - Unconstructed - Deleted - Scenic California State Route 238 is a north-south highway in the southeastern part of the San Francisco Bay Area, USA. A divided... JUNCTION POSTMILE SR-25 SBT ?.?? I-5 FRE ?.?? CA-33 FRE 23. ... JUNCTION MILE POST I-80 SB 0. ... This Interstate Highway article needs to be cleaned up to conform to both a higher standard of article quality and accepted design standards outlined in the WikiProject U.S. Interstate Highways. ... Interstate 278 (abbreviated I-278) is an Interstate Highway in the U.S. states of New Jersey and New York. ... Interstate 478 (abbreviated I-478) is an unsigned Interstate Highway in New York City. ... Interstate 678 (abbreviated I-678) is a north-south interstate highway spur route that runs 14 miles (23 km) entirely within two boroughs of New York City: Queens and the Bronx. ... Interstate 878 is an unsigned route number for the Nassau Expressway in Queens, New York. ... Nickname: Location in the state of New York Coordinates: Country United States State New York Boroughs The Bronx Brooklyn Manhattan Queens Staten Island Settled 1625 Government  - Mayor Michael Bloomberg (R) Area  - City  468. ... Interstate 295 (abbreviated I-295) is a connector route within New York City. ... Interstate 695 (abbreviated I-695) is a short connector route in the Bronx between I-95 and I-295 towards Queens and Long Island. ... Wikimedia Commons has media related to: Interstate 95 Interstate 95 (abbreviated I-95) is a well-known, important, and heavily traveled highway in the United States Interstate Highway System. ... For other uses of the term Westway, see Westway Westway was the name of a proposed project to put New York Citys West Side Highway underground, first planned in 1972 and officially canceled in 1985. ... Nickname: Location in the state of New York Coordinates: Country United States State New York Boroughs The Bronx Brooklyn Manhattan Queens Staten Island Settled 1625 Government  - Mayor Michael Bloomberg (R) Area  - City  468. ... New Jersey State Highway 24 is a state highway in New Jersey, United States. ... Interstate 585 (abbreviated I-585) stretches from an Interstate 85 Business loop to Spartanburg, South Carolina. ... Interstate 85 (abbreviated I-85) is an interstate highway in the southeastern United States. ... Spartanburg is the largest city and the county seat of Spartanburg CountyGR6 in South Carolina, a state of the United States of America, and is the second-largest city of the three primary cities in the Upstate region of South Carolina. ... Interstate 85 Business is a Business Loop of the Interstate Highway System and a freeway, running along the old route of Interstate 85 through Spartanburg, South Carolina, United States. ... U.S. Highway 176 is a spur of U.S. Highway 76. ...

Duplicated Route Numbers

In some cases, interstate route numbers are used on two separate, unconnected lengths of roadway, one in the eastern portion of the country and one in the western portion. Unlike true gaps, these gaps are intentional. That is, there was never any intent that the two sections of roadway bearing the same number would be linked together someday.

Interstate 76 (abbreviated I-76) is an Interstate Highway in the United States, running 435 miles (700 km) from an interchange with Interstate 71 west of Akron, Ohio east to Interstate 295 near Camden, New Jersey. ... Interstate 295 (abbreviated I-295) in New Jersey and Delaware is a bypass route from a junction with Interstate 95 south of Wilmington, Delaware to a junction with I-95 north of Trenton, New Jersey. ... The City of Camden is the county seat of Camden County, New Jersey in the United States. ... INTERSTATE JUNCTIONS JUNCTION EXIT # I-64 KY 1 I-75 KY 77 OH 1 I-70 OH 106 OH 107 I-76 OH 209 I-80 OH 233 I-90 OH 247 Legend BROWSE STATE HWYS Prev Next {{{browse}}} Interstate 71 is an Interstate Highway in the Southeastern and Midwestern... Nickname: The Rubber Capital of the World Location within the state of Ohio Country United States State Ohio County Summit Founded 1825 Incorporated 1835 (village) - 1865 (city) Government  - Mayor Don Plusquellic (D) Area  - City  62. ... Interstate 76 (abbreviated I-76) is an interstate highway that runs from Interstate 70 in Arvada, Colorado (near Denver) to an intersection with Interstate 80 near Big Springs, Nebraska. ... Interstate 80 (abbreviated I-80) is the second-longest Interstate Highway in the United States. ... : The Mile-High City United States Colorado Denver (coextensive) 154. ... Location in Wyoming Coordinates: County Laramie County Founded 1867 Government  - Mayor Jack R. Spiker Area  - City 57. ... Interstate 84 (abbreviated I-84) is an interstate highway extending from Dunmore, Pennsylvania (near Scranton, Pennsylvania) at an intersection with Interstate 81 to Sturbridge, Massachusetts at an intersection with the Massachusetts Turnpike (Interstate 90). ... Sturbridge is a town located in Worcester County, Massachusetts. ... The City of Scranton is the county seat of Lackawanna CountyGR6 in Northeastern Pennsylvania, USA. As of the 2000 census, the city had a total population of 76,415 (2003 estimate: 74,320). ... Columbia River Gorge and I-84 as seen from Crown Point, Oregon Interstate 84 runs from an intersection with Interstate 5 at Portland, Oregon (Map) to an intersection with Interstate 80 (Map) at Echo, Utah—roughly the same route as the Oregon Trail. ... Echo is a town located in the state of Utah. ... Nickname: Location in Multnomah County and the state of Oregon Coordinates: Country United States State Oregon County Multnomah County Incorporated February 8, 1851 Government  - Mayor Tom Potter Area  - City  145. ... Interstate 86 is an intrastate Interstate Highway, located entirely within the state of Idaho. ... Heyburn is a city located in Minidoka County, Idaho. ... Historic downtown Pocatello Pocatello is a city located in Bannock County, with a small portion in neighboring Power County, in southeastern Idaho. ... Tremonton is a city located in Box Elder County, Utah. ... {{{type3}}} JUNCTIONS JUNCTION EXIT # I-90 PA 1 I-390 NY 146 (36) I-99 NY 169 (44) I-81 NY 245 NY (75) I-84 NY 362 (121) I-87 NY Legend BROWSE STATE HWYS Prev Next {{{browse}}} Interstate 86 runs from an intersection with Interstate 90 in Erie... Junction Location US routes and Interstates only. ... Interstate 88 (abbreviated I-88) is an interstate highway entirely within the U.S. state of New York. ... State nickname: Empire State Other U.S. States Capital Albany Largest city New York Governor George Pataki Official languages None Area 141,205 km² (27th)  - Land 122,409 km²  - Water 18,795 km² (13. ... Union Colleges Nott Memorial, one of the most recognized buildings in Schenectady Schenectady (IPA ) is a city in Schenectady County, New York, United States, of which it is the county seat. ... Binghamton is a city located in the Southern Tier of New York in the United States. ... Interstate 88 (abbreviated I-88) is an interstate highway entirely within the state of Illinois. ... Official language(s) English[1] Capital Springfield Largest city Chicago Largest metro area Chicago Area  Ranked 25th  - Total 57,918 sq mi (149,998 km²)  - Width 210 miles (340 km)  - Length 390 miles (629 km)  - % water 4. ... Nickname: Motto: Urbs In Horto (Latin: City in a Garden), I Will Location in the Chicago metro area and Illinois Coordinates: Country United States State Illinois County Cook & DuPage Incorporated March 4, 1837 Government  - Mayor Richard M. Daley (D) Area  - City  234. ... Moline is a city in Rock Island County, Illinois, United States. ...

Other gaps

Not covered earlier, here are a few other cases worth mentioning:

  • Gaps in Interstate Highway standards, such as shoulder widths and bridge clearances, since these are too frequent
  • Gaps on the Interstates in Alaska and Puerto Rico, since those are not held to the same standards
  • Places where Interstates cross but don't connect via a freeway-standard connection (e.g. I-84 and I-87 in New York.).
  • "Non-Interchanges" where Interstates cross but don't connect at all (e.g. I-78 and I-476).
  • Places where a three-digit Interstate connects to its parent via another three-digit Interstate of the same parent; the numbering system allows for this (e.g. I-270 and I-370).
  • Sometimes, near toll booths (e.g. Mackinac Bridge toll booth), a brief segment of the Interstate will have a median break with a double-yellow line but have at least 4 lanes total.
  • Metering lights to regulate the flow of traffic onto bridges and skyways, such as those on westbound I-80 approaching the San Francisco-Oakland Bay Bridge.
  • Median breaks for maintenance and/or emergency vehicles to access government driveways. These exist on many highways that are otherwise considered freeways, including Interstates.
  • Places where non-spur interstates appear to end at a traffic light soon after intersecting with another freeway, such as I-17's terminus at I-40 in Flagstaff, Arizona.
  • Places where an Interstate technically ends partway across a nonconforming bridge on an international crossing, such as where I-75 and I-81 cross into Canada.
  • Business loops and spurs are not subject to mainline freeway standards.
edit
Main Interstate Highways (multiples of 5 in pink)		 Interstate Highway marker
4 5 8 10 12 15 16 17 19 20 22 24 25 26 27 29 30
35 37 39 40 43 44 45 49 55 57 59 64 65 66 66 (W) 68
69 70 71 72 73 74 75 76 (W) 76 (E) 77 78 79 80 81 82
83 84 (W) 84 (E) 85 86 (W) 86 (E) 87 88 (W) 88 (E) 89 90
91 93 94 95 96 97 99 (238) H-1 H-2 H-3
Unsigned  A-1 A-2 A-3 A-4 PRI-1 PRI-2 PRI-3
Lists  Main - Auxiliary - Suffixed - Business - Proposed - Unsigned
Gaps - Intrastate - Interstate standards - Replaced

The American Association of State Highway and Transportation Officials (AASHTO) defines standards for Interstate Highways in their publication A Policy on Design Standards - Interstate System. ... There are four officially designated Interstate Highways in Alaska. ... Interstate 80 (Eastshore Freeway) in Berkeley, a typical American freeway (MUTCD definition) A freeway is a type of highway that is designed for safer high-speed operation of motor vehicles through the elimination of at-grade intersections. ... Interstate 84 (abbreviated I-84) is an interstate highway extending from Dunmore, Pennsylvania (near Scranton, Pennsylvania) at an intersection with Interstate 81 to Sturbridge, Massachusetts at an intersection with the Massachusetts Turnpike (Interstate 90). ... Interstate 87 (abbreviated I-87) is a 346 mile (558 km) intrastate interstate highway located entirely within the state of New York. ... This Interstate Highway article needs to be cleaned up to conform to both a higher standard of article quality and accepted design standards outlined in the WikiProject U.S. Interstate Highways. ... It has been suggested that The North Eastern Extension be merged into this article or section. ... Interstate 270 (abbreviated I-270) is a 34. ... Interstate 370 (abbreviated I-370) is a 3. ... The Mackinac Bridge (pronounced , like MACK-in-aw, note the silent c, and affectionately known as the Mighty Mac or Big Mac), is a suspension bridge spanning the Straits of Mackinac to connect the non-contiguous upper and lower peninsulas of the U.S. state of Michigan. ... On an expressway, motorway, or autobahn, the median (North American English) or central reservation (British English) is the strip of grass or the wall which separates opposing lanes of traffic. ... UK Double yellow lines occur only on the side of carriageways and indicate no parking at any time. Hourly, daily and/or seasonal restrictions may be posted on signs next to the road. ... Metered Ramp A ramp meter or metering light is a device, usually a basic traffic light or a two-phase (red and green, no yellow) light together with a signal controller, that regulates the flow of traffic entering freeways according to current traffic conditions. ... Interstate 80 (abbreviated I-80) is the second-longest Interstate Highway in the United States. ... The San Francisco-Oakland Bay Bridge ( ; known locally as the Bay Bridge) is a toll bridge which spans San Francisco Bay and links the California cities of Oakland and San Francisco in the United States, as part of Interstate 80. ... Interstate 80 (Eastshore Freeway) in Berkeley, a typical American freeway (MUTCD definition) A freeway is a type of highway that is designed for safer high-speed operation of motor vehicles through the elimination of at-grade intersections. ... Interstate 17 is an intrastate interstate highway located entirely within the state of Arizona, United States. ... Interstate 40 (abbreviated I-40) is a major west-east interstate highway in the United States. ... Nickname: Location in Coconino County the state of Arizona Coordinates: Country United States State Arizona County Coconino County Government  - Mayor Joseph C. Donaldson Area  - City  98. ... The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly called the Interstate Highway System, is a network of highways (also called expressways) in the United States. ... Image File history File links I-blank. ... Wikimedia Commons has media related to: Interstate 4 An old shield in Orlando, Florida Interstate 4 (abbreviated I-4) is a 132. ... Interstate 5 (abbreviated I-5) is the westernmost interstate highway in the continental United States. ... Interstate 8 (abbreviated I-8) is an Interstate highway in the southwestern United States. ... Interstate 10 (abbreviated I-10) is the southernmost east-west, coast-to-coast interstate highway in the United States. ... Map of Interstate 12 Interstate 12 (abbreviated I-12) is an intrastate interstate highway located entirely within the state of Louisiana, United States. ... I-15 redirects here. ... Interstate 16 (abbreviated I-16), or Georgia State Route 404, is an intrastate interstate highway located entirely within the state of Georgia, United States. ... Interstate 17 is an intrastate interstate highway located entirely within the state of Arizona, United States. ... Interstate 19 (abbreviated I-19) is an intrastate interstate highway located entirely within the state of Arizona, United States. ... This Interstate Highway article needs to be cleaned up to conform to both a higher standard of article quality and accepted design standards outlined in the WikiProject U.S. Interstate Highways. ... Previously known as Corridor X (one of the Appalachian Regional Corridors), Interstate 22, when completed, will follow the U.S. Highway 78 corridor along a 176 mile (283 km) route from Memphis, Tennessee to Birmingham, Alabama. ... Interstate 24 (abbreviated I-24) is an interstate highway in the eastern United States. ... Interstate 25 (abbreviated I-25) is an interstate highway in the western United States. ... Interstate 26 (abbreviated I-26) is an east-west main route of the Interstate Highway System in the Southeastern United States. ... Interstate 27 is an intrastate interstate highway located entirely within the state of Texas in the United States. ... Interstate 29 (abbreviated I-29) is an interstate highway in the Midwestern United States. ... Interstate 30 (abbreviated I-30) is an interstate highway in the southern United States. ... This Interstate Highway article needs to be cleaned up to conform to both a higher standard of article quality and accepted design standards outlined in the WikiProject U.S. Interstate Highways. ... Interstate 37 is an intrastate interstate highway located within the state of Texas, United States. ... INTERSTATE JUNCTIONS JUNCTION EXIT # Legend BROWSE STATE HWYS Prev Next Interstate 39 (abbreviated I-39) is an interstate highway in the midwestern United States. ... Interstate 40 (abbreviated I-40) is a major west-east interstate highway in the United States. ... Interstate 43 is an intrastate interstate highway located entirely within the state of Wisconsin, United States. ... Interstate 44 (abbreviated I-44) is an interstate highway in the central United States. ... Interstate 45 (abbreviated I-45 or in Texas IH-45) is an intrastate interstate highway located entirely within the state of Texas, United States. ... Interstate 49 (abbreviated I-49) is an intrastate interstate highway located entirely within the state of Louisiana, United States. ... Interstate 55 (abbreviated I-55) is an interstate highway in the central United States. ... Interstate 57 (abbreviated I-57) is an interstate highway in the midwestern United States. ... Interstate 59 (abbreviated I-59) is an interstate highway in the southern United States. ... Wikimedia Commons has media related to: Interstate 64 Interstate 64 (abbreviated I-64) is an Interstate Highway in the eastern United States. ... Interstate 65 (abbreviated I-65) is an Interstate Highway in the United States. ... Interstate 66 (abbreviated I-66) is an interstate highway in the eastern United States. ... The U.S. Department of Transportation has had plans to extend Interstate 66 westward across the country to California. ... Interstate 68 is an interstate highway in the United States. ... Interstate 69 just outside Indianapolis near Fortville, Indiana Interstate 69 (abbreviated I-69) is an interstate highway in the Southern and Midwestern United States. ... Interstate 70 (abbreviated I-70) is a long interstate highway in the United States that runs from Interstate 15 about a mile from Cove Fort, Utah to a Park and Ride in Baltimore, Maryland. ... INTERSTATE JUNCTIONS JUNCTION EXIT # I-64 KY 1 I-75 KY 77 OH 1 I-70 OH 106 OH 107 I-76 OH 209 I-80 OH 233 I-90 OH 247 Legend BROWSE STATE HWYS Prev Next {{{browse}}} Interstate 71 is an Interstate Highway in the Southeastern and Midwestern... Interstate 72 is an interstate highway in the midwestern United States. ... Interstate 73 (abbreviated I-73) is a main route of the Interstate Highway System, currently located entirely within the U.S. state of North Carolina. ... Interstate 74 (abbreviated I-74) is an interstate highway in the Midwestern and southeastern United States. ... Interstate 75 (abbreviated I-75) is an interstate highway in the midwest and southeastern United States. ... Interstate 76 (abbreviated I-76) is an interstate highway that runs from Interstate 70 in Arvada, Colorado (near Denver) to an intersection with Interstate 80 near Big Springs, Nebraska. ... Interstate 76 (abbreviated I-76) is an Interstate Highway in the United States, running 435 miles (700 km) from an interchange with Interstate 71 west of Akron, Ohio east to Interstate 295 near Camden, New Jersey. ... Interstate 77 (abbreviated I-77) is an interstate highway in the eastern United States. ... This Interstate Highway article needs to be cleaned up to conform to both a higher standard of article quality and accepted design standards outlined in the WikiProject U.S. Interstate Highways. ... Interstate 79 (abbreviated I-79) is an interstate highway in the eastern United States. ... Interstate 80 (abbreviated I-80) is the second-longest Interstate Highway in the United States. ... Interstate 81 (abbreviated I-81) is an interstate highway in the eastern part of the United States. ... Interstate 82 (abbreviated I-82) is an interstate highway in the northwestern United States. ... Interstate 83 is an interstate highway in the eastern United States. ... Columbia River Gorge and I-84 as seen from Crown Point, Oregon Interstate 84 runs from an intersection with Interstate 5 at Portland, Oregon (Map) to an intersection with Interstate 80 (Map) at Echo, Utah—roughly the same route as the Oregon Trail. ... Interstate 84 (abbreviated I-84) is an interstate highway extending from Dunmore, Pennsylvania (near Scranton, Pennsylvania) at an intersection with Interstate 81 to Sturbridge, Massachusetts at an intersection with the Massachusetts Turnpike (Interstate 90). ... Interstate 85 (abbreviated I-85) is an interstate highway in the southeastern United States. ... Interstate 86 is an intrastate Interstate Highway, located entirely within the state of Idaho. ... {{{type3}}} JUNCTIONS JUNCTION EXIT # I-90 PA 1 I-390 NY 146 (36) I-99 NY 169 (44) I-81 NY 245 NY (75) I-84 NY 362 (121) I-87 NY Legend BROWSE STATE HWYS Prev Next {{{browse}}} Interstate 86 runs from an intersection with Interstate 90 in Erie... Interstate 87 (abbreviated I-87) is a 346 mile (558 km) intrastate interstate highway located entirely within the state of New York. ... Interstate 88 (abbreviated I-88) is an interstate highway entirely within the state of Illinois. ... Interstate 88 (abbreviated I-88) is an interstate highway entirely within the U.S. state of New York. ... Interstate 89 (abbreviated I-89) is an interstate highway in the New England portion of the United States. ... Wikimedia Commons has media related to: Interstate 90 Interstate 90 (abbreviated I-90) is the longest interstate highway in the United States at nearly 3,100 miles (5,000 kilometers). ... Interstate 91 (abbreviated I-91) is an interstate highway in the New England section of the United States. ... This Interstate Highway article needs to be cleaned up to conform to both a higher standard of article quality and accepted design standards outlined in the WikiProject U.S. Interstate Highways. ... Interstate 94 (abbreviated I-94) is a long interstate highway connecting the Great Lakes and Intermountain region of the United States. ... Wikimedia Commons has media related to: Interstate 95 Interstate 95 (abbreviated I-95) is a well-known, important, and heavily traveled highway in the United States Interstate Highway System. ... Interstate 96 (abbreviated I-96) is an intrastate Interstate highway that is entirely within the U.S. state of Michigan. ... Interstate 97 (abbreviated I-97) is an intrastate Interstate highway located entirely within Anne Arundel County, Maryland, United States. ... Interstate 99 (abbreviated I-99) is a main route of the Interstate Highway System in central Pennsylvania. ... Interstate 238 (abbreviated I-238) is a short (2. ... Interstate H-1 is an intrastate interstate highway in Hawaii, United States, on the island of Oahu. ... Interstate H-2 (also known as the Veterans Memorial Freeway) is an intrastate interstate highway located on the island of Oahu in Hawaii. ... Interstate H-3 in Halawa Valley looking towards the Koolau crest Interstate H-3 (also known as the John A. Burns Freeway) is an intrastate interstate highway located on the island of O‘ahu in the state of Hawai‘i, United States. ... There are four officially designated Interstate Highways in Alaska. ... There are four officially designated Interstate Highways in Alaska. ... There are four officially designated Interstate Highways in Alaska. ... There are four officially designated Interstate Highways in Alaska. ... The Autopistas de Puerto Rico are highways in Puerto Rico designed to replace Puerto Ricos older Interstate highways (PR-1, PR-2, and PR-3). ... There are three officially designated Interstate Highways in Puerto Rico. ... There are three officially designated Interstate Highways in Puerto Rico. ... Primary interstates are the major interstate highways of the United States and are assigned a one or two-digit route number. ... This is a list of auxiliary (three-digit) Interstate Highway designations in the United States. ... The 1958 Interstate Highway System plan included many suffixed Interstates. ... The Interstate Highway System of the United States, in addition to being a network of freeways, also includes a number of Business Routes assigned by the American Association of State Highway and Transportation Officials. ... The Interstate Highway system is still being expanded. ... Some Interstate Highways are not signed, typically because the routes are already known by another name, and marking them would add to confusion. ... The following two-digit United States Interstate Highways do not cross state lines. ... The American Association of State Highway and Transportation Officials (AASHTO) defines standards for Interstate Highways in their publication A Policy on Design Standards - Interstate System. ... The Interstate Highway System and its numbering as approved June 27, 1958; several of these numbers were modified by 1960 This is a list of highways, mostly U.S. Routes, bypassed by Interstate Highways. ...

Sources

References

  1. ^ http://www.fhwa.dot.gov/programadmin/toll_Rds.html
  2. ^ http://tollroadsnews.info/artman/publish/article_969.shtml
  3. ^ http://www.kyinbridges.com/
  4. ^ http://maps.google.com/maps?q=Breezewood+PA&ll=39.999224,-78.235917 Map
  5. ^ http://terraserver.microsoft.com/image.aspx?T=1&S=10&Z=17&X=3680&Y=22156&W=2&qs=%7cBreezewood%7cPA Aerial photo
  6. ^ http://www.okroads.com/031603/i70pabreezewood.jpg
  7. ^ http://www.okroads.com/031603/i70pabreezewood_2.jpg
  8. ^ http://www.okroads.com/delaware/i70pa.html
  9. ^ http://maps.google.com/maps?q=Jersey+City+NJ&ll=40.731088,-74.041382&spn=0.003317,0.008615&t=h Map and Aerial photo
  10. ^ http://www.interstate-guide.com/images051/i-078_et_03.jpg Eastbound I-78 in Jersey City
  11. ^ http://www.interstate-guide.com/images051/i-078_et_02.jpg Westbound I-78 in New York City
  12. ^ http://www.interstate-guide.com/i-078.html
  13. ^ http://maps.google.com/maps?q=Cheyenne+WY&ll=41.124657,-104.80751&spn=0.01319,0.034461 Map
  14. ^ http://maps.yahoo.com/beta/index.php#mvt=h&maxp=search&q1=Cheyenne+WY&trf=0&lon=-104.808605&lat=41.123542&mag=3 Aerial photo
  15. ^ http://maps.google.com/maps?q=Philadelphia&ll=39.955757,-75.150797&spn=0.003355,0.008615&t=h Aerial photo
  16. ^ http://www.interstate-guide.com/i-086_west.html
  17. ^ http://www.interstate-guide.com/i-086_east.html
  18. ^ http://www.fhwa.dot.gov/planning/econdev/i86trip2005.htm

  Results from FactBites:
 
Interstate Highway (2886 words)
By initial planning, the Interstate System was designed to be able to move traffic at speeds of 75 to 80 miles per hour (120 to 130 km/h) except in limited stretches (such as steep mountain passes) where Many vehicles cannot maintain such speeds.
In 1974, the maximum speed limit allowed on interstate Highways (along with all others in the country) was reduced to 55 mph (90 km/h) as a gasoline conservation measure in response to the 1973 energy crisis.
On even-numbered Interstates, mileage increases to the east and decreases to the west; and on odd-numbered Interstates, mileage increases to the north and decreases to the south.
Historical Overview (1587 words)
In 1968, Interstates 284 and 484 were added, part of an extensive list of now-cancelled expressways in metro Hartford.
The new highways, proposed to fill gaps in the network or serve future needs, were never built, as the political climate changed and we learned more about construction, traffic, and their effects.
Interstate 84 was widened to six lanes from Massachusetts to Vernon, and eight to 12 lanes from there to East Hartford.
  More results at FactBites »


 

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