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Montana Oversize Permits Details

Montana Department of Transportation Motor Carrier Services Division

Address: 2550 Prospect Avenue Helena, Montana 59601

Contact: (406) 444-7262

Hours: 8:00 A.M. – 5:00 P.M. (MT)


Single trip permits are valid for three (3) consecutive days.


SingleDepends on axle spacings. 20,000
TandemDepends on axle spacings. 48,000
TridumDepends on axle spacings. 51,750
QuadDepends on axle spacings. 55,440

Gross Weight:

5 Axles107,000
6 Axles110,000
7 Axles114,000
8 Axles126,000

Length: 150’

Width: 18’

Height: 17’

When Escorts Are Needed:

On Interstate:                        # of Escorts

Width over 16’6”1 Rear
Length over 120’1 Rear

On 2- Lane or Multi-Lane Non-interstate:

Width over 12’6” up to 14’1 Front
Width main body of load over 14’ or overall width is over 15’2 (Front & Rear)
Length over 110’1 Rear
If escort is required on non-interstate only (i.e., load dimensions not over 16’ wide or 120’ long) 
Width over 10’ and not equipped with lights and signs state requires2 (Front & Rear)
Height over 17’ (before permit appl.)Route Survey


No more than 5 O/O loads needing escorts may convoy if width not over 14’ (or 15’ w/ projections) and not over 120’2 (Front & Rear)
No more than 5 vehicles needing escorts may convoy if length of any unit is over long on 2-Lane highways or 110’ long on interstate highways.2 (Front & Rear)

*For convoys, escort must have sign stating: “Oversize Load, Convoy Follows (# of vehicles).”

Vectra Heavy Haulers, a trusted name in equipment delivery, will ensure the secure delivery of your cargo to Idaho as well. We follow all the regulations laid out in federal, state, and local jurisdictions for ensuring trouble-free delivery. For more information on transportation regulation permits for Montana Oversize goods.