Secure Your Montana Oversize Permits Today – Call Now!
Montana (MT) DOT Phone no.# (270)908-9656
Oversize & Overweight Trucking Permits for Single Trip, Fuel, Overhang and Annual Permits
Oversize permits validity, Legal Dimensions, Routine Permits requirements, Escort/Pilot car information all your needs
Montana (MT) oversize permits validity: These permits valid for three-days. Before entering with a heavy haul, it is necessary to secure permits.
Montana (MT) Legal Dimension
Length: 53 feet acceptable for semi-trailer and 75 feet acceptable with rear over hang or more than 53 feet.
Overhang: 75 feet acceptable overall length with overhang. Up to 75 feet need a permit.
Width: 8 feet 6 inches
Height: 14 feet
Weight: 80,000lbs Gross, Single Axle 20,000lbs, Tandem Axles 34,000lbs and Tridem Axles 42,000lbs.
Instructions: If all of your axle weights are within legal limits and you are registered for at least your gross weight, you may surpass 80,000 pounds without a permit.
Montana (MT) Routine Permit Limit
Length: 150 feet
Width: 18 feet
Height: 17 feet
Weight: Single Axle 24,000lbs, Tandem Axles 48,000lbs and Tridem Axles 62,700lbs. 5,6 and 7 axles depend on distance.
Variable depending on axle spacing.
You must be registered for at least the weight limit in Montana.
Instructions: DW21 circumstances: On two-lane roadways, a tridem axle weighing about 54,300 pounds (depending on axle spacing) causes DW21 circumstances, requiring two pilot cars. On two-lane roadways, a tridem axle weighing more than 48,000 pounds (depending on axle spacing) might cause 5 MPH conditions, which do not need pilot vehicles but limit traffic to daylight hours only. Loads that surpass these dimensions may be called superloads.
Montana (MT) Travel Time: Continuous transit is permitted for weights up to 10 feet in width, 15 feet 6 inches in height, and 110 feet in length. Travel is authorized during daytime hours, including weekends, for loads up to 18 feet wide, 18 feet high, or 120 feet long, with the exception of Red Route routes. Travel on two-lane roads at DW21 and 5 MPH is only authorized during daytime hours.
Montana (MT) Travel Restrictions: Red Route roadways are blocked from 3:00 PM on Friday to dawn on Saturday, and from 12:00 AM on Sunday to sunrise on Monday, if their dimensions exceed 10 feet in width, 14 feet 6 inches in height, or 110 feet in length. No transit is permitted for load more than 18 feet in width, 18 feet in height, or 120 feet in length between 4:00 PM on Fridays and Monday AM. During the holidays, travel is normally permitted for load no larger than 10 feet in width, 14 feet 6 inches in height, or 110 feet in length.
Montana (MT) Seasonal Restrictions: Some routes have spring restriction. From February to May, Usually, these restrictions not applied interstates routes

Montana (MT) Escort / Pilot Car Requirements and Information
On Interstate roads
Length: More than 120 feet, required one escort.
Width: More than 16 feet 6 inches, required one escort.
Height: More than 16 feet may have two-lane alternate routes and 17 feet depends on routes but not usually required.
Hon Two-lane roads
Length: More than 110 feet required one escort.
Width: More than 12 feet 6 inches required one escort and more than 14 feet required two escorts.
Height: More than 17 feet required one escort with high pole.
Weight: More than 54,300lbs to 55000lbs on tridem axles required two escorts (DW21 Conditions).
Signal, lights and flags requirements for oversize load In Montana (MT):
For vehicles or loads that are over 10 feet wide, you must display “Oversize Load” signs at both the front and rear. Additionally, you need to have 5-inch flashing amber lights or rotating beacons on each end of these signs. If you use a single beacon light, it should be mounted on the power unit and must be visible from all directions. The rear of the load or truck should have light if height or width of load, is blocked. A “Long Load” sign must be put at the rear of any vehicle or load combination that exceeds 105 feet on non-state roads and 120 feet on interstate highways. Loads that are smaller than 110 feet in total length do not need this indication.
Montana (MT) Single trip (IRP) OR Fuel (IFTA) and Annual Permits:
To obtain Montana (MT) Single trip (IRP) OR Fuel (IFTA) and Annual Permits, the carrier must log into the state’s online permitting system, acknowledge the permit conditions, enter the vehicle and load information, select the travel dates, and provide the route details. Get your permits by calling us at (270)908-9656.
Get Your permit Now
Montana (MT) Overweight Permit
This permit is necessary when a vehicle exceeds the allowable weight restrictions imposed by an authority. It guarantees that the truck may move securely on roadways while causing no harm to infrastructure.
Montana (MT) Overlength Permit
The permit is required for vehicles that exceed the standard-length limit. It enables the transportation of longer goods, such as huge beams or pipes, while maintaining their safety and legality.
Montana (MT) Fuel/Trip Permit
These permits are normally valid for one trip and is often necessary for trucks that do not have a regular IFTA (International fuel tax agreement) in place and IRP (International Registration Plan) registered. It enables the truck to drive through particular countries while remaining compliant with fuel tax requirements.
Montana (MT) Overhang Permit
The permit is required when a load exceeds the rear or front of the vehicle. It guarantees that the overhanging weight is delivered securely, without endangering other road users.
Montana (MT) Overwidth Permits
A permit is necessary for vehicles that exceed the normal width limitations. It enables the transportation of larger loads, such as massive equipment or prefabricated constructions, while maintaining their safety and legality.
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FAQ'S Asked Questions about Oversize Permits
Montana oversize permits information including legal dimensions, routine permit limits, and escort requirements, operating times and restricted travel.
Length: up to 75 ft.
Width: Up to 8'6".
Height: up to 14 feet.
Weight: Maximum gross truck weight is 80,000 pounds.
You may get an overweight permit from the Montana Department of Transportation (MDT) online using our website application or by phoning their office at (630) 222-5770.
A trip permit is required if your vehicle is moving out of state, is not registered under the International Registration Plan (IRP), has three or more axles, or weighs more than 26,000 pounds.
The allowable overhang restrictions are 3 feet in front and 15 feet in back. If the vehicle's entire length, including the overhang, exceeds 75 feet, a permit is necessary.
Trucks must follow specified speed limits and weight limitations on bridges and roadways. A copy of the permit must be in the vehicle. Additional permissions may be required for travel on local roads.
Permits may be requested online via our website application, or by calling the MDT. Different permissions may be needed based on the weight and route.
The maximum gross vehicle weight (GVW) is 80,000 pounds. The axle weight restrictions are 20,000 pounds for a single axle, 34,000 pounds for a tandem axle, and 42,000 pounds for a tridem.
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