A concurrency, overlap or coincidence on a road network occurs where a single physical road carries two or more different highway, motorway, or other road numbers. Mitchell Freeway in Perth, Western Australia For other uses, see Highway (disambiguation). ... Motorway mark in Europe A motorway (in the United Kingdom, Ireland, New Zealand and some Commonwealth nations) is both a type of road and a classification. ... A road number is a number assigned to a stretch of road, or of a long distance route. ...

The practice is relatively common; where two roads must pass through a single geological feature, or crowded city streets, it is advantageous for road designers to merely divert them down the same road, saving on the cost of a new road.

In the United States, highways often form concurrencies in rural areas. As highways in the U.S. are signed with a cardinal direction, it is possible for two highways signed with opposite directions to be running along the same piece of road; a "wrong-way concurrency". Most of the time, concurrencies are simply marked by placing signs for both routes on the same post; occasionally a state will instead sign the road as "to" the less major route. Several states don't officially have any concurrencies, instead officially ending routes on each side of one. In these states, concurrencies are typically poorly signed. In the mid-20th century, California had numerous concurrencies, but the California Legislature removed most concurrencies in a comprehensive reform of highway numbering in 1964. Cardinal directions or cardinal points are the four principal directions or points of the compass, north, east, south and west. ... A wrong-way concurrency between Interstates 77 and 81, and U.S. Highway 52 in southwestern Virginia A wrong-way concurrency or wrong-way multiplex is a road concurrency in which at least two routes are signed in opposite, conflicting directions on the same physical road. ... (19th century - 20th century - 21st century - more centuries) Decades: 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s As a means of recording the passage of time, the 20th century was that century which lasted from 1901–2000 in the sense of the Gregorian calendar (1900–1999 in the... Official language(s) English Capital Sacramento Largest city Los Angeles Area  - Total  - Width  - Length  - % water  - Latitude  - Longitude Ranked 3rd 410,000 km² 402. ... The California State Legislature is the legislative branch of the state government of California. ... For the Nintendo 64 emulator, see 1964 (Emulator). ...

In the United Kingdom, it is common for major through routes to run concurrently with others. Only one road number (typically that of the more heavily used route) is ever shown on road signs however; the other road is either bracketed on the sign, implying that the major route leads to a junction with the minor route (which it will do at the end of the concurrency), or left off altogether. For example, the A82 concurs with the A85 for five miles in western Scotland. Each route-confirmation sign-header gives the road number as "A82 (A85)". The A449 and A40 concur from Raglan to Ross-on-Wye, some fifteen miles straddling the Welsh-English border at Monmouth, is actually well double-signposted, but is confusing in road atlases, where only "A40" is shown, yet it is the A449 that is a dual carriageway link between the M4 and M50 motorways. The A82 is the major road to the western Scottish Highlands, running from Glasgow to Inverness. ... The A85 is a major road in Scotland. ... Royal motto: Nemo me impune lacessit (English: No one provokes me with impunity) Scotlands location within the UK Languages English, Gaelic, Scots Capital Edinburgh Largest city Glasgow First Minister Jack McConnell Area - Total - % water Ranked 2nd UK 78,782 km² 1. ... The A40 is a trunk road in England and Wales, connecting London to Fishguard. ... Raglan is a seaside town and surrounding district associated with Whaingaroa Harbour (also known as Raglan Harbour) on the west coast of the Waikato region in New Zealands North Island. ... Location within the British Isles. ... This is about the Welsh town of Monmouth. ... The M4 motorway is a motorway in the UK, which links London and west Wales via Bristol. ... The M50 The M50 motorway in England runs for twenty-two miles westward from the M5 motorway just north of Tewkesbury, to meet the A40 road and A449 road at Ross-on-Wye. ...

Multiplex is a neologism, albeit well-used, used by roadgeeks for this concept, as an extension of other meanings of the term. A neologism is word, term, or phrase which has been recently created (coined) —often to apply to new concepts, or to reshape older terms in newer language form. ... A roadgeek (sometimes roadfan) is a person that is interested in roads as a hobby. ... Multiplex may mean: Multiplex (comics), a DC Comics character. ...