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Oklahoma City Crosstown Expressway
The Oklahoma City Crosstown was an elevated four mile (6 km) stretch of Interstate 40 that dissected downtown Oklahoma City from Agnew Avenue to Byers Avenue. It was owned and maintained by the Oklahoma Department of Transportation (ODOT). It was the primary east–west artery through Oklahoma City, and served as an unofficial dividing line between north and south Oklahoma City (the official dividing line for address purposes is Sheridan Avenue). While the Crosstown designed to withstand about 76,000 vehicles a day, it was used by nearly 120,000 vehicles a day by 2010. The Crosstown was completed in the 1960s using an engineering process commonly termed as "fracture critical", a process that has not been used since the 1970s because it does not provide redundancies.〔Transportation Resource Board. Development of system fracture analysis methods and inspection standards for fracture critical steel bridges. 12 December 2006. Available at http://rip.trb.org/browse/dproject.asp?n=12670〕 According to Brian Windsor, an ODOT structural engineer, without redundant support, the failure of a single beam creates the risk of total collapse of that section of bridge.〔''The Oklahoman.'' 2007 August 05 Page 11A〕 The entire stretch of the Crosstown was elevated, and at some points, the elevation is as much as 50 feet (15.2 m). Other safety problems of the previous Crosstown include falling chunks of concrete and a lack of breakdown lanes. In an August 2007 poll sponsored by ''The Oklahoman'', nearly of respondents indicated that they were "afraid to drive across the Crosstown bridge in Oklahoma City".〔''The Oklahoman.'' 2007 August 09 Page 2A〕
==Context==
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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