Massachusetts OSOW permits

Updated: Sep 2

Permits valid for five travel days. Must have a permit prior to entering the state.

Massachusettes permitting system:

Contact phone number: 1-781-341-5148


Generally, vehicles under 12' wide and under 14' high may travel from Monday morning 12:01 a.m. through noon on Saturday and Sunday from 12:01 a.m. until noon. Vehicles between 12' and 14' wide, over 13'11" in height, and over 80' long (but not over 114' long) are only permitted for travel sunrise to sunset Monday through Friday except no travel allowed between 7:00 a.m. – 9:00 a.m. or between 3:30 p.m. – 7:00 p.m.


No travel on major holidays, and some holiday weekends. Check with the Sammons Permit Office. Routes 95 and 93 in the Boston area are restricted to travel only between 9:30 a.m. to 3:30 p.m.

Massachusetts Turnpike:

Between the NY line and I-95, no permit is required up to 10' wide, legal weight, and up to 80' long. Turnpike permits are issued for vehicles and loads up to 12' wide, 13'9" high, 80' long, and up to 99,000 pounds. (Lower limits apply to the Sumner, Callahan and Ted Williams Tunnels in the Boston area.) Permits to exceed these dimensions on the Turnpike require special engineering approval plus a $350.00 fee. Vehicles/loads over 12' wide, over 100' long or over 130,000 gross require a police escort. The Turnpike phone number is 781-431-5148.


Width: 8'6"

Height: 13'6"

Length: 53' semi-trailer on Interstate and designated highways.

Weight: 80,000 Gross Single – 24,000 designated highways (22,400 other roads)

Tandem – 34,000 Tridem – 42,500


Width: 14'

Height: 14' (Over 13'8" requires a height survey)

Length: 115'

Weight: 130,000 pounds gross

Single, Tandem, Tridem – Depends on axle spacings

*Loads exceeding these dimensions are treated as super loads. Over 130,000 pounds gross requires an engineering company survey of structures. This can cost several thousand dollars, depending on the route and number of structures!


Width: Over 12' – 1 escort; over 13'6 – 2 escorts; 12' and up dozer with blade – 2 escorts.

Height: Over 13' 8" – route/height survey; over 13'9" (depending on route) – 1 escort; over 13'11" (depending on route) – 2 escorts.

Length: Over 80' – 1 escort; over 95' – 2 escorts; 115' or more – 2 State Police escorts.

On Massachusetts Turnpike, over 12' wide, over 100' long or over 130,000 pounds gross requires a police escort.

In the City of Boston, if over legal dimensions, at least 1 State Police escort.

On Cape Cod, width over 12' – at least one State Police escort.


"Oversize Load" sign required on the rear of an oversize vehicle that does not require an escort. Mount red flags on extremities and corners for any over-width or over-length vehicle. For all O/D loads made during hours of darkness, a flashing amber light shall be in operation above the highest point of the vehicle and visible from the front and rear of the vehicle.

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