Friday, January 7, 2011

Wrong Way Concurrency in Virginia

Our lovely guest from Indiana just called to give us an ETA and to say she had passed through the I-77 Tunnel and "What an auspicious entryway for your state to have."

Interstate 77 through Virginia passes through two tunnels. The Big Walker Mountain Tunnel and the East River Mountain Tunnel provide quick interstate access with minimal environmental disruption. For eight miles (13 km), Interstates 77 and 81 overlap near Wytheville. This is a wrong-way concurrency, where two roads run concurrent with each other but are designated in opposite directions.

Wrong-way concurrency

This westbound highway insouthwestern Virginia simultaneously carries Interstates 77 and 81 in opposite directions. The wrong-way concurrency is also reflected in U.S. Route 52 and U.S. Route 11, which are concurrent with I-77 and I-81, respectively.

An example of a wrong-way concurrency in Oklahoma City, Oklahoma. The wrong-way concurrency is highlighted in red.
As highways in the United States and Canada are usually signed with a cardinal direction, it is possible for two highways signed with opposite, conflicting directions to be running along the same stretch of physical roadway. The road itself is likely to be actually pointed in a third direction.
For example, near Wytheville, Virginia, there is a concurrency between Interstate 77 (which runs and is signed north-south) and Interstate 81 (which runs primarily northeast-southwest but is also signed north-south). The road itself is oriented east-west and carries the two Interstates signed in opposite directions. So one might simultaneously be on I-77 north and I-81 south, while actually traveling due west. Another well-traveled example is the I-580 and I-80 concurrency in the Bay Area of California, known locally as the Eastshore Freeway, which travels north-south along the shoreline of San Francisco Bay.
At least two roads run concurrently with their own opposite direction. A short stretch of Broadway in Pawtucket, Rhode Island carries both directions of Route 114[dubious ], and a short stretch of northbound Interstate 376, as well as the ramps leading to it, in Pittsburgh, Pennsylvania carries both directions of U.S. Route 19 Truck.[5]
An unusual example of a three-directional concurrency occurs near the town of Starks, Illinois. To take advantage of an underpass beneath a railroad, US Route 20Illinois Route 72 and Illinois Route 47 all converge. The net result is that a driver can be traveling east on US 20, west on IL 72, and south on IL 47 (the actual compass direction) all at the same time. [6]
Canada also possesses at least three wrong-way concurrencies: an 11-km (7 mi) stretch of SaskatchewanHighways 2 and 11 between Chamberlain and Findlater, a 7-km (4 mi) stretch of British Columbia Highways 5 and97 in Kamloops, and a 10-km segment of New Brunswick Route 8 and Route 117 in Miramichi.

This information is from Wiki click here.
Or as my Dad always says
"Your feet smell and your nose runs!"

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