A
concurrency in a road network is an instance of one physical road bearing two or more different
highway,
motorway, or other
route numbers. When two
freeways share the same
right-of-way, it is sometimes called a
common section or
commons. 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.