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ALL Hazardous Cargo ("HC") and Cargo Tankers are prohibited from the Boston Tunnels (underground highway system).
The Non-Radioactive Hazardous Materials (“NRHM”) route designation is divided into two main categories as follows: (1) Restricted Route for ALL NRHM and (2) Designated NRHM Route. Each route is identified with one or more restriction or designation codes which follow the route description. Restriction codes identify which materials may not be transported along the given route, while designation codes indicate which materials the routing authority has determined should be shipped along the preferred/recommended or prescribed route. For more details, please see MassDOT’s Notice of Regulation for Metro-Boston Non-Radioactive Hazardous Material Route Designation.
From North of Boston along I-93 (Preferred/Recommended Route):
*Hazardous Cargo may travel as far south on I-93 as Exit 26, but will be restricted from traveling through Downtown Boston to points south. Only local deliveries within Boston will be permitted to travel in Downtown Boston.
From South of Boston along I-93(Preferred/Recommended Route):
*Hazardous Cargo may travel as far north on I-93 as Exit 18, but will be restricted from traveling through Downtown Boston to points south. Only local deliveries within Boston will be permitted to travel in Downtown Boston.
Through Routing of all Hazardous Cargo is RESTRICTED from Downtown Boston during the Daytime Hours (6 a.m. to 8 p.m.).
From North of Boston along I-93 (Prescribed Route):
*Due to the restriction of hazardous cargo in the I-93 tunnel system, signs are posted to alert all drivers that Exit 26 (Leverett Circle/Storrow Drive) is the last exit before the tunnel. Should NHRM vehicles get off I-93 Southbound at Exit 26, follow the route listed below back to the Prescribe Route noted above:
From South of Boston along I-93 (Prescribed Route):
Note: There are hazardous cargo (HC) trailblazer signs through Downtown Boston that follow the prescribed NHRM route and direct HC to Interstate 93 North and South of the City of Boston.