Commercial truck permits - height and weight limitations

When do I need a permit? Permits are necessary if your truck exceeds certain limitations. Use this page to quickly check if you might need a permit.

Table of Contents


If you're applying for a truck permit, you first want to check if your truck meets the state's regulations. Your truck’s weight and height is taken into consideration before it requires an oversize/overweight permit.

Legislation Regarding Dimensions and Weights of Trucks and Trailers

Weight limitations

Please reach out to the permits department with any questions regarding weight limitations.

Height limitations

Your truck will not require a special permit if it does not exceed:

  • A width, including load, of 8 ft. 6 in. (If using tunnels)
  • A height, including load, of 13 ft. 6 in. (If not using tunnels)

There are also restrictions on your vehicle’s height depending on the route you are travelling and the vehicle type. Below are the maximum heights allowed per way and type of vehicle.


Maximum Vehicle Height


 13 feet 6 inches

Ted Williams Tunnel

 13 feet 6 inches

Callahan Tunnel

 12 feet 6 inches

Sumner Tunnel

 12 feet 6 inches

O'Neill Tunnel (I-93)

 13 feet 6 inches

CANA (City Square) Tunnel

 13 feet 6 inches

Other Locations Not Listed

 13 feet 6 inches

Length limitations

Type of Vehicle

Maximum Vehicle Length

Motor vehicle not listed

 33 feet

Vehicle combination not listed other than semi trailer

 60 feet

Articulated bus

 60 feet

Auto home

 40 feet

Automobile transporter (traditional)

 65 feet

Automobile transporter (stinger-steered)

 75 feet

Boat transporter (traditional)

 65 feet

Boat transporter (stinger-steered)

 75 feet

Boat transporter (truck trailer)

 65 feet

Bus or school bus

 45 feet

House trailer

 40 feet

Saddlemount combination

 75 feet


 53 feet

Trailer in tractor-trailer combination

 53 feet

Trailer not in tractor-trailer combination

 33 feet


 40 feet

Holiday restrictions

No movements are allowed on the following holidays:

  • New Year's Day
  • Memorial Day
  • Independence Day
  • Labor Day
  • Thanksgiving Day
  • Christmas Day

No movements are allowed between noon the day preceding and noon the day following these holidays: New Year's Day, Independence Day, and Christmas. Otherwise, travel is allowed on State Highways from Monday morning at 12:01 a.m. to noon on Saturday, and Sunday morning from 12:01 a.m. to noon.

Contact   for Commercial truck permits - height and weight limitations


Mon-Fri 7 a.m. - 3 p.m.


(781) 431-5014


Walk-in hours Mon-Fri 7:15 a.m. - 2:30 p.m.
668 South Avenue, Weston, MA 02493

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