Water froze in an expansion joint and surrounding concrete, and when it thawed, the concrete became dislodged from the joint and fell into the road, according to officials. Inspection crews ...

The expansion joints resemble interlocking fingers and connect slabs on the 1960s-era bridge's deck, which allow the structure to expand and contract while preventing concrete from cracking.

MassDOT said they have conducted inspects across over 150 points throughout the Boston-area tunnel system after concrete came ... at the Huntington Avenue expansion joint in the Prudential Tunnel ...