Determine if a permit is required
- A permit is issued to a carrier to allow operation of a vehicle or load that exceeds the statutory limits.
- Permitted loads must be nondivisible.
- Permits are issued by the Iowa DOT for state and interstate highways only. Separate permits must be obtained from local city or county jurisdictions for travel on those roadways.
Definition of an indivisible loadAny load or vehicle exceeding applicable length, height, width or weight limits that if separated into smaller loads or vehicles, would:
- Compromise the intended use of the vehicle (i.e., make it unable to perform the function for which it was intended).
- Destroy the value of the load or vehicle (i.e., make it unusable for its intended purpose).
- Require more than eight work hours to dismantle using appropriate equipment.
Legal dimensionsA permit is typically required if vehicle dimensions exceed:
|Width||8 feet 6 inches|
|Height||13 feet 6 inches|
|Length||41-foot single vehicle|
|53-foot trailer, loaded or empty|
|57-foot lowboy trailers used exclusively for the transportation of construction equipment|
More information and exceptions to the dimensions listed above is available at the following links.
WeightA permit is typically required if vehicle gross weight exceeds 80,000 pounds. Maximum individual axle weight allowed under permit is 20,000 pounds per axle.
For more information and exceptions to the above weight limits:
Additional resources and information is available at the following links.
- Iowa Code 321E – Vehicles of Excessive Size and Weight
- 761 IAC 511 – Special Permits for Operation and Movement of Vehicles and Loads of Excess Size and Weight
- Iowa Truck Information Guide
If you have questions:
- Email: firstname.lastname@example.org
- Phone: 515-237-3264
- Fax: 515-237-3257
- Mailing address:
Iowa Department of Transportation
Office of Vehicle and Motor Carrier Services
P.O. Box 10382
Des Moines, IA 50306