Montana Oversize Permits

Montana (MT) Legal Dimensions

Length: 53 feet 6 inches long semi-trailer is allowed. If the trailer exceeds 53 feet in length and there is overhang (rear or front), a maximum overall length of 75 feet (truck and trailer) is allowed.

Overhang: 75 feet overall length (with overhang) is allowed. A permit is required when overall length exceeds 75 feet.

Width: 8 feet 6 inches.

Height: 14 feet.

Weight: 80,000 pounds Gross.
Single Axles: 20,000 Pounds.
Tandem Axles: 34,000 Pounds.
Tridem Axles: 42,000 Pounds.

Important: Divisible load exceeding 80,000 Pounds: You may exceed the overall weight limit of 80,000 Pounds without a permit as long as all axle/group weights are valid and you are licensed for at least that amount.

Montana (MT) Permits Validity, Restrictions and Operating Time

Montana (MT) Permits Validity: Montana (MT) oversize permits are valid for 3 to 5 days.

Montana (MT) Operating Time: Continuous travel is permitted throughout daylight hours between half an hour before sunrise and half an hour after sunset, including weekends. For weights up to 10 feet wide, 15 feet 6 inches high, and 110 feet long. Only Red Route routes are permitted to transport load more than 18 feet in width, 18 feet in height, or 120 feet in length. On two-lane highways, DW21 and 5 MPH conditions limit traffic during daylight hours.

Montana (MT) Restrictions on Travel: Travel on Red Route highways is restricted after 3:00 p.m. on Fridays and until sunrise on Saturday. If the load exceeds 10 feet in width, 14 feet 6 inches in height, or 110 feet in length, transit is forbidden from 12:00 p.m. on Sunday to sunrise Monday. Travel restrictions apply to load wider than 18 feet, higher than 18 feet, or longer than 120 feet from 4:00 PM on Friday until Monday AM. The Red Route map may be seen online or at weigh stations. Loads of no more than 10 feet wide, 14 feet 6 inches high, or 110 feet long are usually permitted for holiday travel.

Seasonal Restriction on Travel: Spring thaw restrictions may apply to specific roads between February and May. Interstate routes are typically not impacted.

Montana (MT) Routine Permits Limits

Length: 150 feet.

Width: 18 feet.

Height: 17 feet.

Weight: Variable based on axle spacing. You must be registered for the minimal weight quantity permitted in Montana.

Single Axles: 24,000 Pounds

Tandem Axles: 48,000 Pounds
Tridem Axles: 62,700 Pounds.

5, 6 and 7 Axles: Depending on distance.
Important: DW21 circumstances: If a tridem axle on a two-lane roadway transports approximately 54,300 pounds (depending on axle spacing), DW21 circumstances apply, necessitating the use of two pilot vehicles. If a tridem axle on a two-lane road weighs more than 48,000 pounds (depending on axle spacing), it may cause 5MPH conditions, which do not need pilot cars but are limited to daylight hours only. Loads that surpass these dimensions are called super loads.

Montana (MT) Escorts/Pilot Cars Information

Length: On interstate routes more than 120 feet, required one escort and on 2 lane routes more than 110 feet required one escort.

Width: On Interstate routes more than 16 feet 6 inches required one escort and on 2 lane routes More than 12 feet 6 inches required one escort, 14 feet two escorts.

Height: On interstate routes:

It’s normally not required, although for routes more than 17 feet and for two-lane highways over 16 feet, it may depend on the specific route.

On 2 lane routes:

More than 17 feet one escort needed with high pole.

Weight: On 2 lane routes more than 54,300 Pounds on tandem axles two escorts are necessary in DW21 condition.

Symbols, Banners, Lights information: Vehicles with loads wider than 10 feet have to display ‘Oversize Load’ signs in both the front and rear. Additionally, each end of the oversize load sign on the power unit must be outfitted with 5-inch flashing amber lights, rotating beacons, or strobe lights. A single beacon light on the power unit may be utilized if it is visible in all directions. If the light is blocked by the load’s height or width, extra illumination should be installed at the rear of the load. A ‘Long Load’ sign shall be placed at the rear of combinations longer than 105 feet on non-state roads and 120 feet on interstate highways. Loads under 110 feet in total length do not need overlength signage.

Montana (MT) Oversize permits Regulations and Information
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