Length: Over 130′ – 1 escort
Width:
- On Interstate Highways: Over 16′ – 1 escort
- On most State Highways: Over 20′ – 1 escort
Multiple escorts are required if the load extends more than two feet into adjacent driving or passing lanes, or if traffic cannot pass without the permitted vehicle or passing vehicle driving on the shoulder of the road. Black Hills area, except on US16 from Rapid City to Keystone, WY & US 18: over 10′ – 1 escort.
Height: Normally no requirements.
SEASONAL LOAD (WEIGHT) RESTRICTIONS: Spring thaw load weight restrictions may go into effect any time after February 15th. Check with Permit Office.
SIGNS, FLAGS & LIGHTS: All overdimensional vehicles and loads must display flags. Flags must be attached to all corners of vehicles or loads wider than 8’6” and to corners of any load extending beyond the width of the hauling vehicle. Flags are also to be attached to load projections exceeding 3 feet in front of the vehicles front bumper, or more than 4 feet beyond the rear of the trailer. If the front or rear projection is not wider than two feet, at least one flag is needed on the projection, and 2 flags are required on the projection if it is over 2 feet in width. “Oversize Load” or “Oversized Load” signs are required front and rear on all permit vehicles that exceed a width of 12 feet or a length of 95 feet, or that operate during nighttime hours. Signs must be reflectorized when used for night moves. Signs must be covered or removed when they are not required. Load projections must be lighted for nighttime running with amber lights, red lights, and reflectors. The specific requirements of nighttime lighting are listed on the South Dakota permit.
