Meanwhile, the Tobin Bridge’s southbound upper and ... the frequency of vessels going under the bridge, the probability that a vessel will go off course, the probability of a bridge collapse ...

"You can't build it under the existing bridge, and we have a nice community ... about what investment could mean in the future. "The Tobin cuts through a large part of Chelsea Square and downtown ...

That group also includes Boston’s Tobin Bridge and the Sagamore and Bourne bridges on Cape Cod. The NTSB said its report “does not suggest that the 68 bridges are certain to collapse,” however.