The
Callahan Tunnel, officially the
Lieutenant William F. Callahan Jr. Tunnel is one of four
tunnels, and one of three road tunnels, beneath
Boston Harbor in
Boston, Massachusetts. It carries motor vehicles from the
North End to
Logan International Airport and
Route 1A in
East Boston. Ordinarily, this tunnel is only used to carry traffic out of the city, and with the completion of the
Big Dig it only collects traffic from
I-93 southbound (right after traffic merges from Storrow Drive) and downtown Boston. There is no toll in this direction. Traffic from the airport and Route 1A towards downtown Boston and I-93 northbound normally flows in the older, parallel
Sumner Tunnel, where a $3.50 toll is collected (raised from $3 on January 1, 2008).