South Dakota
South Dakota Highway Patrol
Motor Carrier Services
118 West Capitol Avenue
Pierre, SD 57501-2000
PHONE: (605) 773-4578

Hours of Business

8:00 AM - 5:00 PM (Central time)


When escorts are needed and # of escorts required

  • Width over 16′ on interstate: 1 escort (Rear)
  • Width over 20′ on state highways: 1 escort (Front if 2-lane highway and Rear if multi-lane)
  • The permit issuing authority may also require escort vehicles because of route limitations, traffic conditions, or unusual permit vehicle configuration conditions.

Black Hills Area: Except on US 16 from Rapid City to the Keystone Wye and on US 18, a vehicle that exceeds a width of 10′ must be accompanied by a front escort when operating on state highways in the Black Hills Area. The Black Hills Area is that area south and west of I-90 from the Wyoming State Line to Rapid City, west of SD 79 from Rapid City to the junction of SD 79 and US 18, west of US 18 from the junction of SD 79 and US 18 to Oelrichs, and west of US 385 from Oelrichs to the Nebraska State Line.

A local highway patrol trooper may waive the front escort requirement for a specified period of time on any section of state highway in the Black Hills Area if the highway has adequate geometrics to provide for the safe operation of the vehicle.

Escort vehicle requirements can differ significantly by state in terms of mandatory driver qualifications, training, certifications, vehicle weights, obligatory signage/flags/lighting, necessary onboard equipment, and more. The ODS team can provide you with all additional requirements specific to your route.

Operating Times

Travel is permitted from 1/2 hour before sunrise to 1/2 hour after sunset 7 days a week.

Loads not exceeding 10′ wide and 14’6″ high may travel on Interstate Highways continuously.

Loads just overweight may travel 7 days a week.

Oversize vehicles may move at night in limited circumstances. Overweight permit vehicles may move at night provided they do not require an escort. No movement of oversize vehicles at night will be allowed except for permits issued for overlength, Longer Combination Vehicles, emergency movement, and interests of national defense.

Permit vehicles up to 10′ wide, 14’6″ high, and length limitations as outlined below, are allowed to move on Interstate Highways at night with limited access at interchanges.

Movement is restricted to daylight hours if one or more of the following conditions exist:

  1. An escort vehicle is required;
  2. The permit vehicle is not able to attain the speed of posted speed limits and is not able to maintain a speed within posted speed limits;
  3. The permit vehicle is wider than 10′;
  4. The permit vehicle is higher than 14’6″;
  5. The permit vehicle is a single unit whose overall length exceeds 45′;
  6. The permit vehicle is a multiple-unit combination whose overall length exceeds 110′;
  7. The permit vehicle is a 2-unit combination with an individual unit length longer than 60′;
  8. The permit vehicle is a 3- or more unit combination with an individual unit length longer than 48′;
  9. The permit vehicle will travel on State highways which are non-Interstate and beyond a 2-mile radius of an Interstate Highway interchange.

A permit issuing authority may place the daylight hours restriction on a permit if traffic, highway, or other conditions indicate the need for such a restriction.


No restrictions noted.

Adverse weather:

Spring Weight Restrictions: Certain highways may be subject to spring load limits during the period of February 15 to April 30. While spring load limits are in effect, limited overweight permits will be issued.