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North Dakota

North Dakota Oversize Permits Information


Oversize permits are valid for 3 days. Driver must have permit prior to entering the state.

Operating Time

Sunrise to sunset, including Saturday and Sunday except loads over 16 feet wide and 110 feet long cannot travel Saturday afternoon or Sunday all day. Overweight only can have continuous travel.


Loads over 16′ wide are not permitted to travel starting 12 noon the day prior to a major holiday until sunrise the day after the holiday.

Speed Limit

40 mph. if the gross weight exceeds 120 000 pounds. OS loads do not have additional speed limits unless otherwise specified on permit.

Legal Parameters

  • Width: 8’6″
  • Height: 14′ (unless routes of travel include structures that are not 14′)
  • Length: 53′ semi-trailer and load, 75 overall including load and any rear overhang
  • Weight: 80,000 Gross; Single – 20,000; Tandem – 34,000; Tridem – 48,000

Routine North Dakota Oversize Permit Limits

  • Width: 18′
  • Height: 18′
  • Length: 120′
  • Weight: Steer – 12,100 for 11″ tires (550 pounds per inch of tire width); Single – 24,000; Tandem – 45,000; Tridem – 60,000; Quad – 68,000


  • Width: Over 14’6″ on 2-lane highways– 1 escort; over 16′ – 2 escorts on 2-lane highways or 1 escort on 4-lane highways; over 18′ – 2 escorts and 1 Police escort.
  • Length: Over 120′ – 1 escort
  • Height: Over 18′ – written authority from utility companies to travel under overhead wires.

*Note: Instead of pilot car, for width over 14’6 but not over 16′, load may be equipped with lighted rotating or flashing amber light(s) that are visible from the front and rear at 500 feet

Security Measures

“Oversize Load” sign is required on rear of the vehicle when overall length exceeds 75′. All over dimensional loads must have red or bright orange flags, 18″ square, on the traffic side of the load front and rear. Loads authorized with night movements are required to have clearance lights visible from the front, rear and side, marking the outermost portion of the vehicle and load which extends beyond legal width; 1 rotating or 2 flashing amber lights mounted above the cab visible at a distance not less than 500′; flashing amber lights are required at the rear when lights on the cab are not visible. Overhang of 4′ or more shall be marked at the extreme end of the load with flags (red, 12″ x 12″) during day and red lights during night travel.

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