Do You Need a Montana Trucking Permit?

DOT Office

Po Box 4639, Helena, MT 59604

Permit Office




External Website

Permit Validity

5 Travel Days

Transportation Restrictions

The holidays are New Year’s Day, Memorial Day, 4th of July, Labor Day, Thanksgiving Day, and Christmas Day.

Vehicles combinations exceeding 10’ wide (11’ 6” for commercial hay grinders), 110’ long, and over 14’ 6” high are not allowed to travel on holidays or holiday weekends.

If the holiday is on Friday or Saturday there is no travel on Friday, Saturday and Sunday. If the holiday falls on Sunday or Monday there is no travel on Saturday, Sunday and Monday. If the holiday falls on a Tuesday, Wednesday or Thursday, travel is not allowed on that day only, and travel will be allowed on the days preceding and following the holiday. (exception: Implements of Husbandry may not be restricted).

On Red Route Highways, single units over 55’ long, vehicles combinations exceeding 10’ wide, combinations over 110’ long and over 14’ 6” high may not travel after 3:00 PM on Friday to sunrise on Saturday and from noon on Sunday to sunrise on Monday. Vehicle combinations exceeding 18’ wide, 120’ long, or 18’ high may not travel after 3:00 PM on Friday until sunrise on Monday.

Class 1 superloads may be moved only during daylight hours, Monday through Friday. No travel is allowed on holidays or holiday weekends. No travel is allowed after 3 PM on Friday until sunrise on Monday on routes indicated on “red route restrictions” map.

Class 2 superloads may be moved only during daylight hours, from sunrise on Monday until 3:00 PM on Friday.

Extreme caution shall be exercised in the operation of a vehicle when hazardous conditions such as those caused by snow, ice, sleet, fog, mist, rain, dust, smoke, areas of maintenance and construction or any other condition which adversely affect visibility, traction, or the safety of the traveling public. Speed shall be reduced when such conditions exist. When conditions become sufficiently dangerous, the company or operator shall discontinue operations until the vehicle can be safely operated. No travel is allowed when a route has been placed under emergency travel conditions as determined by the Department of Transportation.

Operating Time

Continuous travel allowed for loads that do not exceed 10’ in width, 14’6” in height, 110’ in length. Loads exceeding those dimensions but not exceeding 18’ wide, 120’ long, or 18’ high (vehicles hauling hay: 14’6” High and 55’ long) may travel 7 days a week during day light hours only. Any loads exceeding the previous dimensions may only travel Monday through Friday during daylight hours.

Weekend Travel

See Operating TIme

Transportation Requirements


Anything above Routine Issue dimensions require special approval from the DOT.

Oversize Load Signs

“Oversize Load” signs required for loads exceeding 10’ wide.


Flags required when the load exceeds 12’6” wide (16’6” on interstate) and 110’ long (120’ on interstate).

Two flashing amber lights required at the end of the wide load sign. Lights must be operating at all times when moving an oversize load.


Dozer blade Ok for oversize / overweight as long as the blade doesn’t exceed the width of the

Routine Issues

Component Restriction
Width 18'
Height 17'
Length 150'
Axle Weights Determined on a Case-by-Case basis

Escort Requirements

Dimension Requirement
Width 10'-12'6" 2 (Front & Rear)*
Width Over 12'6" 1 Front**
Width Over 16'6" 2 (Front & Rear)
Length 110' 1 Rear
Superload 3 (1 Front & 2 Rear) On Interstates, 4 (2 Front & 2 Rear) On Non-Interstate
Superload - Length Only 2 (Front & Rear) On Interstate

*Escorts required if load is not equipped with lights and signs as required by law
**Rear escort also required if not equipped with lights and signs as required by law

We are committed to providing expert-level guidance to truckers, transport agencies, and those seeking to secure their permits. It is our mission to keep you both safe and legal as you haul your loads. We pride ourselves on being fast and affordable. Let us support your fleet and learn what it means to work with America's most liked permit agency.

Donald Beeman, President Donald Beeman, President

Coast 2 Coast Trucking Permits

5410 Homberg Drive, Suite 33 Knoxville, TN 37919

Call (888) 963-0830

Fax (865) 963-0831

Email [email protected]

Hours of Operation

Monday - Friday
7:00 AM - 5:30 PM EST