100 Massport Haul Road
South Boston, Ma. 02210
Telephone: 617-946-3000

State Police Tunnels opened in December 1995, is located above the South Boston portal of the Ted Williams Tunnel (TWT). The TWT was originally designated as the Third Harbor Tunnel and was the first portion of the Central Artery/Tunnel Project (the 'Big Dig') to be completed, inaugurated on December 15, 1995. The Tunnels barracks covers 45 miles of highways, including all Big Dig roadways and the intricate system of highways, tunnels, ramps and connectors.

The Big Dig is the largest public works project in the nation's history and was constructed while maintaining service to the old elevated highways. Major roadways include: I-93 North from Exit 18 in South Bay to Exit 28 in Charlestown; I-93 South from Exit 26 in Somerville to the South Bay Mall in Dorchester; I-90 (MassPike) East and West between Interchange 19/20 in Allston Brighton and Route 1A in East Boston; the Leverett Connector North and South, between Somerville and Leverett Circle. Other tunnels covered by E-4 personnel are the Sumner and Callahan Tunnels under Boston Harbor, the CANA Tunnels under City Square in Charlestown, the Prudential and O'Neil Tunnels running east and west, and the most recent Liberty Tunnel running north and south along Route 93.

Major considerations for the E-4 patrol area is the 'Quick Clearance' policy for clearing disabled/damaged vehicles from the Tunnels, and the confined-space hazards related to high traffic volumes transiting 18 miles of tunnel roadways. The 'Quick Clearance' protocol involves the Emergency Response System (ERS), placing troopers at seven 24-hour per day posts, four weekday rush-hour posts, and dedicated Incident Response Tow Trucks dispatched from the Operations Control Center (OCC). In addition, E-4 patrols numerous significant interchanges: I-90 at Logan Airport; I-90 at I-93; I-90 at Allston/Brighton, I-93 at the Mass. Ave. Connector; I-93 at Leverett Circle/Storrow Drive; I-93 at Route 1. E-4 also patrols Boston's new landmark, the 'Leonard P. Zakim Bunker Hill Bridge' spanning the Charles River.