A truck drives past a damaged barrier on the Davison bridge leading to I-75 in Detroit on Thursday, Sept. 12, 2013. An average of 1,000 vehicles an hour cross the Davison bridge in Detroit to get on

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A truck drives past a damaged barrier on the Davison bridge leading to I-75 in Detroit on Thursday, Sept. 12, 2013. An average of 1,000 vehicles an hour cross the Davison bridge in Detroit to get on Interstate 75. The lanes are tight. Concrete barriers show marks from collisions. The concrete urban bridge is among 28 in Michigan labeled "structurally deficient" and "fracture critical." (AP Photo/Paul Sancya) less 

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Associated Press
Mon, Sep 16, 2013 3:58 PM EDT