Concurrency (road)

Concurrency (Road)

Concurrency (road)

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A concurrency, overlap, or coincidence in a road network is an instance of one physical road bearing two or more different highway, motorway, or other route numbers. (PDF)—see Route 3 for instance] When it is two freeways that share the same right-of-way, it is sometimes called a common section or commons.Star Tribune, Freeway flaws; Fixing them may take decades, June 3, 2005: defines "common sections" as "2 freeways share a single right-of-way"Minnesota Department of Transportation, , accessed October 2007: gives the AADT at several such interchanges, calling them "commons"

Road enthusiasts often use the term multiplex—as well as the more specific duplex and triplex—to refer to such instances although those type are the more common instances.

Concurrency is a relatively common phenomenon: where two routes must pass through a single geological feature, or crowded city streets, it is often both economically and practically advantageous for them both to be accommodated on one road.

Often when two routes with exit numbers overlap (concurrency), one of the routes has its exit numbers dominate over the other and can sometimes result in having two exits of the same number, albeit far from each other along the same highway. An example of this is from the concurrency of I-94 and US 127 near Jackson, Michigan. The concurrent section of freeway has an exit with M-106, which...
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