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 ...

The National Transportation Safety Board recommended that 68 bridges undergo ... began requiring vulnerability assessments of new bridges in 1994, the NTSB said. The Key Bridge was built before ...

The 68 bridges that the NTSB recommends for assessment are those designed before the guidance was established and do not have a current vulnerability assessment, the NTSB said. They include iconic ...

The NTSB over the last year identified 68 bridges designed ... At the time, AASHTO also recommended that all bridge owners conduct a vulnerability assessment on existing bridges to "evaluate ...

The 68 bridges are owned by 30 entities ... like the Key Bridge —and do not have a current vulnerability assessment, the NTSB said. The recommendations are issued to bridge owners to calculate ...

The 68 bridges that the NTSB recommends for assessment are those designed before the guidance was established and do not have a current vulnerability assessment, the NTSB said. In addition to the ...