North Dakota's freight economy is dominated by two forces: oil and gas extraction from the Bakken Shale formation in the west, and large-scale agricultural production — wheat, corn, soybeans, and sunflowers — across the remainder of the state. The Bakken region, centered on Williston and the US-2/US-85 corridor, generates massive volumes of oilfield freight including drilling equipment, pipe, frac sand, produced water, and crude oil, much of which moves on secondary roads with lower structural ratings. The North Dakota Department of Transportation (NDDOT) manages the highway network and issues oversize/overweight permits, while the Highway Patrol enforces commercial vehicle compliance. North Dakota permits longer combination vehicles (LCVs) on designated routes, allowing 105-foot overall length B-trains and other configurations, which is a significant advantage for agricultural bulk haulers. Harsh winters create frost law conditions each spring that significantly reduce allowable weights on non-primary roads. Carriers operating in western ND should monitor road condition advisories, as oilfield road restrictions are common. The ND Motor Vehicle Division administers IRP and IFTA credentials.
| GVWR | 80,000 lbs federal interstate standard; up to 105,500 lbs with permits on non-interstate highways |
| Single axle | 20,000 lbs |
| Tandem axle | 34,000 lbs |
Spring frost law restrictions significantly reduce allowable weights on non-primary roads (sometimes to 6 tons per axle). LCV routes allow extended vehicle lengths and higher weights with appropriate permits. Oilfield secondary roads frequently carry lower posted limits.
State trucking association: North Dakota Motor Carriers Association
NDDOT annually posts spring frost law restrictions on non-primary routes, typically in March through May depending on temperatures. Allowable axle weights on restricted roads can drop to as low as 6 tons per axle (12,000 lbs), far below normal limits. Carriers must monitor NDDOT and county postings before operating on secondary routes during the spring thaw period. Fines for violations are significant.
Yes. North Dakota permits LCV configurations including B-trains and Rocky Mountain doubles up to 105 feet on designated LCV routes. Carriers must obtain LCV permits from NDDOT and may only operate on NDDOT-approved LCV roads. LCVs are popular for agricultural bulk hauling and certain oilfield freight applications.
NDDOT issues oversize/overweight permits for loads exceeding standard limits. Oilfield freight moving on secondary roads in western ND requires careful permit routing, as many county roads have lower structural ratings and may be subject to road bans. Permits are available through the NDDOT permit office, and carriers should also check county road restrictions separately.
IRP apportioned registration and IFTA credentials are both administered by the ND Motor Vehicle Division. Applications can be submitted through the NDDOT motor carrier services portal. IFTA decals must be displayed on qualifying vehicles; quarterly fuel tax returns are filed with NDDOT.
Verified 2026-05-26.