Over the last year, the NTSB has identified 68 bridges that were designed before the AASHTO guidance was established — like the Key Bridge — and therefore do not have a current vulnerability ...

Over the last year, the NTSB identified 68 bridges built before 1991 that don't have a "current vulnerability assessment." The recommendations were issued to 30 owners of the 68 different bridges ...

Federal officials identified 68 bridges across the U.S. that should undergo reviews to determine their vulnerability to collapse in a ship strike.

The Mackinac Bridge is one of 68 U.S. spans that need to be evaluated for collapse risk. The NTSB recommends ... owners conduct the vulnerability assessments on existing bridges to evaluate ...

The report recommends that bridge owners conduct assessments based ... for risk assessments? The NTSB recommended that these 68 bridges undergo a "vulnerability assessment to determine the risk ...