![]() ![]() British Columbia Highway 5 continues east for 12 kilometres (7.5 mi) concurrently with Highway 1 and Highway 97, through Kamloops. ![]() Regional examples North America Ī section of Ontario Highway 400 runs concurrent with a branch of the Trans-Canada HighwayĬoncurrencies are also found in Canada. The second example is in downtown Athens, Georgia, between exits 4 and 8 of Georgia State Route 10 Loop, where the highway is concurrent with US 29, US 78, US 129, US 441, State Route 8 (SR 8), SR 15, and SR 422. Once I-69 is extended south of Indianapolis, this segment will have a nine-way concurrency. The first example is in Indianapolis, between exits 46 and 47 of the 53-mile (85 km) I-465 beltway, where the highway is concurrent with U.S. There are at least two examples of eight-way concurrencies. The longest Interstate highway concurrency is I-80 and I-90 for 265 miles (426 km) across Indiana and Ohio, while the longest Interstate highway concurrency with three interstates is I-39, I-90, and I-94 in Portage, Wisconsin for over 29 miles (47 km). The concurrency of I-41 and I-43 on this roadway is an example of a wrong-way concurrency. A triple Interstate concurrency is found in Wisconsin along the five-mile (8.0 km) section of I-41, I-43, and I-894 in Milwaukee, Wisconsin. I-70 merges with the Pennsylvania Turnpike so the route number can ultimately continue east into Maryland instead of having a second physical highway built to carry the route, it is combined with the Pennsylvania Turnpike and the I-76 designation. In these countries, there are a variety of concurrences which can occur.Īn example of this is the concurrency of Interstate 70 (I-70) and I-76 on the Pennsylvania Turnpike in western Pennsylvania. In those nations which do permit concurrencies, it can become very common. Some countries allow for concurrencies to occur, however, others specifically do not allow it to happen. This is often practically advantageous as well as economically advantageous it may be better for two route numbers to be combined into one along rivers or through mountain valleys. Most concurrencies are simply a combination of at least two route numbers on the same physical roadway. However, any route that becomes unsigned in the middle of the concurrency will still be signed on most maps and road atlases. In some jurisdictions, however, concurrent numbering is avoided by posting only one route number on highway signs these routes disappear at the start of the concurrency and reappear when it ends. Where multiple routes must pass between a single mountain crossing or over a bridge, or through a major city, it is often economically and practically advantageous for them all to be accommodated on a single physical roadway. Ĭoncurrent numbering can become very common in jurisdictions that allow it. Other terminology for a concurrency includes overlap, coincidence, duplex (two concurrent routes), triplex (three concurrent routes), multiplex (any number of concurrent routes), dual routing or triple routing. When two roadways share the same right-of-way, it is sometimes called a common section or commons. ![]() US 220 and US 421 were rerouted from this concurrency in 2008.Ī concurrency in a road network is an instance of one physical roadway bearing two or more different route numbers. An extreme example: I-40, I-85 Business, US 29, US 70, US 220, and US 421 ran concurrently in Greensboro, North Carolina. ![]()
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