Concrete debris fell from the Prudential Tunnel in Boston Friday afternoon, damaging several vehicles. The incident was ...

Of course, this brilliant trend has led to more crashes than anyone can count, with one particularly disastrous incident happening recently at Boston’s (Thomas P.) O’Neill, Jr. Tunnel.

With increasing volume, a single tunnel with traffic moving on one lane in each direction proved dangerous and inadequate, and the Turnpike Authority opened the Callahan on Nov. 11, 1961.