New Hampshire
Department of Transportation
Bureau of Highway Maintenance
John O. Morton Building, Room 120
P.O. Box 483
Concord, New Hampshire, 03302-0483
PHONE: (603) 271-2691

Hours of Business

Mon-Fri 8:00 AM - 4:00 PM (Eastern time)


When escorts are needed

On undivided highways

  • Width 12′ and under 14′ requires 1 escort
  • Height over 14′ requires 1 escort
  • Front/rear overhang exceeding 15’ requires 1 escort
  • If overhang exceeds 15′ AND width exceeds 12′, then 2 escorts are required
  • Length equal to or greater than 90’ requires 1 escort

On divided highways

  • Width over 14’ requires 2 police escorts
  • Length equal to or greater than 100’ requires a police escort
  • Complete or partial highway closure requires 3 police escorts

State police

  • A state police escort are required when load, including hauling vehicle, exceeds 100’ in length.
  • Two state police escorts are required when load, including hauling vehicle, exceeds 14’ in width.
  • Three state police escorts are required if the movement requires highway closure or closure of a portion of a highway.

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

Movement of over-dimensional loads shall be restricted to daylight hours (a half hour before sunrise to a half hour after sunset) on Monday through Friday. Travel is restricted on Saturdays and Sundays.

Vehicles that are only overweight and otherwise legal are not restricted in regards to time of travel.


Travel restrictions apply on New Year’s Day, Martin Luther King Jr./Civil Rights Day, President’s Day, Memorial Day, Independence Day, Labor Day, Columbus Day, Veteran’s Day, Thanksgiving Day, and Christmas Day.

Adverse weather

Travel is not allowed during periods of slippery pavement conditions or inclement weather (i.e., fog, haze, heavy rain, freezing rain, or snow) creating hazardous driving conditions.