“Many fracture critical bridges were erected in the 1950s to 1970s during construction of the interstate highway system because they were relatively cheap and easy to build. Now they have exceeded their designed life expectancy but are still carrying traffic — often more cars and trucks than they were originally expected to handle. The Interstate 5 bridge in Washington state that collapsed in May was fracture critical. Cities and states would like to replace the aging and vulnerable bridges, but few have the money; nationally, it is a multi-billion-dollar problem. As a result, highway engineers are juggling repairs and retrofits in an effort to stay ahead of the deterioration.”
http://teapartyeconomist.com/2013/09/16/government-run-bridges-guaranteed-erosion/
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