Bridges that haven’t been assessed share something in common — they’re old, dating as far back as 1883 in the case of the Brooklyn Bridge. New bridges have to undergo assessments.

The 68 bridges were divided into two categories, "critical/essential" and "typical." Those deemed critical/essential are those that serve as "important links." The Key Bridge had this classification.

Bridges that haven’t been assessed share something in common — they’re old, dating as far back as 1883 in the case of the Brooklyn Bridge. New bridges have to undergo assessments.

The agency said the 68 bridges in the report are not certain to collapse. Rather, they need to be evaluated to determine whether they meet the acceptable risk threshold based on guidance from the ...

Even though existing bridges were not required to conduct a vulnerability assessment, the NTSB said in a news release that AASHTO recommended in 1991 — and again in 2009 — that all owners of ...