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George Wallace Tunnel
The George Wallace Tunnel is a pair of road tunnels that carry Interstate 10 in Mobile, Alabama from the city's downtown, beneath the Mobile River, and emerge on Blakeley Island where they join the Jubilee Parkway over Mobile Bay.〔"Frequently Asked Questions" (notes), Mobile Area Chamber of Commerce, 2006. (MCCOM-FAQ web page )〕
It, like the smaller Bankhead Tunnel a few blocks upriver from it, was constructed in Mobile at the shipyards of the Alabama Drydock and Shipbuilding Company (ADDSCO) from 1969-1973.〔 The George Corley Wallace Tunnel, actually two separate tunnels (one for two lanes of travel eastbound, and one for two lanes of travel westbound on Interstate 10), was built in sections and floated to the proper positions, then sunk. Each section was sunk next to the previous section and joined underwater. When all sections were connected, and concrete set into place, they were pumped dry and finished out. The depth of clearance is 40 ft (12.2 m) for the ship channel over the tunnel.〔 This is the same clearance as the older Bankhead Tunnel.
==Entrances==
The George C. Wallace Tunnel, like the Bankhead Tunnel, emerges on the west end under Royal Street, in downtown Mobile (''see map''); however, whereas the Bankhead Tunnel emerges at street level joining into Government Street, the George C. Wallace Tunnel slopes upward to continue Interstate 10 as an elevated highway above the Mobile streets. On the eastern end, over Blakeley Island, the George C. Wallace Tunnel again slopes upward becoming the elevated spans of I-10, which cross Mobile Bay eastward, along the twin bridges of the curved I-10 Jubilee Parkway.
The western approach of the tunnel features a sharp curve which causes lengthy traffic backups in each direction depending on demand, and is part of the impetus to study a replacement for the tunnel.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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