Parclo A4 Interchange

Parclo B2 Interchange (folded diamond)

Parclo AB3 Interchange (hybrid)

The parclo interchange (short for partial cloverleaf interchange) is a successor to the cloverleaf interchange. The parclo interchange was developed by the Ontario Ministry of Transportation [1] as a replacement for the cloverleaf on 400-Series Highways, removing the dangerous weaving patterns and allowing for more acceleration and deceleration space on the freeway. The design has been well received, and has since become one of the most popular freeway-to-arterial interchange designs in North America. I, the creator of this image, hereby release it into the public domain. ... I, the creator of this image, hereby release it into the public domain. ... I, the creator of this image, hereby release it into the public domain. ... I, the creator of this image, hereby release it into the public domain. ... I, the creator of this image, hereby release it into the public domain. ... I, the creator of this image, hereby release it into the public domain. ... In the field of road transport, a road junction is a place where two or more roads either meet or cross. ... A cloverleaf interchange is a two-level interchange in which left turns are handled by loop ramps. ... It has been suggested that this article or section be merged with List of Ontario expressways. ... In the field of road transport, a road junction is a place where two or more roads either meet or cross. ... Jump to: navigation, search World map showing North America A satellite composite image of North America North America is a continent in the northern hemisphere bordered on the north by the Arctic Ocean, on the east by the North Atlantic Ocean, on the south by the Caribbean Sea, and on...

In Ontario, the specific variation is identified by a letter/number suffix after the name. Other jurisdictions don't have any naming conventions, so Ontario's are used in this article. The letter A designates that two ramps each are in the upper left and lower right of the arterial crossing, while B designates the opposite. The number designates how many quadrants of the interchange contain ramps. In left-hand drive countries, the designations are reversed. Common parclo configurations include the Parclo A2, Parclo B2 and Parclo A4. The Parclo A2 and B2 are commonly used on rural freeways such as the Highway 402 and Highway 416, where the ramps can be added without widening the street overpass/underpass to include deceleration lanes (normally needed on the A4 in order to safely enter the loop ramps that lead to the freeway). The Parclo A2 and B2 ramps are also usually longer and allow for higher speeds than their A4 counterparts because of rural land availability. The Parclo A4 contains 6 ramps. On each side on the freeway, there is an exit ramp, followed by a loop ramp and directional ramp entering the freeway. Jump to: navigation, search Motto: Ut Incepit Fidelis Sic Permanet (Loyal she began, loyal she remains) Other Canadian provinces and territories Capital Toronto Largest city Toronto Lieutenant-Governor James K. Bartleman Premier Dalton McGuinty (Liberal) Area 1,076,395 km² (4th) • Land 917,741 km² • Water 158,654 km² (14. ... Highway 402 as part of the 400-series network Highway 402 is a 400-Series Highway in southwestern Ontario, Canada that runs from the Blue Water Bridge in Point Edward (a suburb of Sarnia) and Highway 401 in London. ... Highway 416 as part of the 400-series network Highway 416 is a 400-Series Highway in eastern Ontario that forms an important connection between Highway 417 in Ottawa and Highway 401 near Prescott. ...

The Parclo A4 is one of the most popular designs, as all movements from the arterial road to the entrance ramps are made by right-hand turns, providing for a safer entrance to the freeway by eliminating left-hand turns into opposing traffic, and queues waiting to make such turns. Traffic exiting the freeway to the arterial road is also provided with a long, relatively straight exit ramp, preventing most speed-related rollovers. The Parclo A4 is particularly well-suited to suburban areas with high traffic levels; Ontario freeways built in the Greater Toronto Area since the 1970s such as Highway 403, Highway 404, and Highway 410 uses this design at almost all individual junctions except where land conditions do not permit it. The first freeway constructed in the GTA 30 years later, Highway 407, still retains the Parclo A4 interchanges wherever possible. Jump to: navigation, search The Greater Toronto Area (called the GTA by local residents) is the largest metropolitan area in Canada and is centred around the fifth largest city in North America, Toronto, after Mexico City, New York City, Los Angeles, and Chicago. ... Jump to: navigation, search The 1970s in its most obvious sense refers to the decade between 1970 and 1979. ... External links Detailed History of Highway 403 Detailed Route Information for Highway 403 Categories: Stub | Ontario provincial highways ... Highway 404 as part of the 400-series network Highway 404 is an Ontario 400-Series Highway that runs from the junction of Highway 401 and the Don Valley Parkway in Toronto to its northern terminus at Green Lane/Herald Road in Newmarket. ... Categories: Stub | Ontario provincial highways ... This article or section should include material from 407 ETR International Highway 407 as part of the 400-series network Highway 407, officially called 407 ETR, is a pay-per-use freeway located in south-central Ontarios Greater Toronto Area. ...

Parclo designs with only two quadrants are commonly referred to as folded diamonds, due to their similarity with diamond interchanges. Sometimes the ramps in a folded diamond are actually local streets; surface roads upgraded to higher standards often do this to save money on land acquisition. This type of interchange long predates the Parclo; the Merritt Parkway and Queen Elizabeth Way, both built in the 1930s, used mainly folded diamonds and cloverleaves. A typical diamond interchange. ... Merritt Parkway in Fairfield County, Connecticut. ... The Queen Elizabeth Way as part of the 400-series network The Queen Elizabeth Way (commonly referred to as the QEW, Q, QE, or Queen-E) is a vital freeway linking Buffalo, New York and the Niagara Peninsula with Toronto and its western suburbs. ... Jump to: navigation, search // Events and trends The 1930s were described as an abrupt shift to more radical lifestyles, as countries were struggling to find a solution to the global depression. ... A cloverleaf interchange is a two-level interchange in which left turns are handled by loop ramps. ...

Depending on traffic and land needs, hybrid designs, such as the Parclo AB and Parclo A3, can be created. Other variants, not describable using Ontario's system, eliminate one or more outside ramps, while leaving the loop ramps in those quadrants.

In California, Caltrans currently has a policy that whenever cloverleaf interchanges between freeways and surface streets are being rebuilt to handle higher traffic loads, they will be turned into parclo interchanges by removing some of the loop ramps (or in rare cases bridges will be added between adjacent loop ramps — see cloverleaf interchange for details). However, as for cloverleaf interchanges between freeways, they are being unwound into partial stack interchanges or made safer with slip ramps as funds permit. Jump to: navigation, search State nickname: The Golden State Other U.S. States Capital Sacramento Largest city Los Angeles Governor Arnold Schwarzenegger (R) Senators Dianne Feinstein (D) Barbara Boxer (D) Official language(s) English Area 410,000 km² (3rd)  - Land 404,298 km²  - Water 20,047 km² (4. ... Caltrans logo The soaring ramps in the stack interchanges favored by Caltrans often provide stunning views. ... A cloverleaf interchange is a two-level interchange in which left turns are handled by loop ramps. ...