For Current North Dakota State Highway Road Restrictions, see the map below:
For More Information about North Dakota Road Restrictions, see the website below:
The Bridge Formula Weights Calculator provides a convenient way to determine the maximum allowable weight that any set of axles on a motor vehicle may carry on the Interstate highway system.
Congress enacted the Bridge Formula in 1975 to limit the weight-to-length ratio of a vehicle crossing a bridge. This is accomplished either by spreading weight over additional axles or by increasing the distance between axles. Compliance with the Bridge Formula weight limits is determined by using the following formula:
W = the overall gross weight on any group of two or more consecutive axles to the nearest 500 pounds.
L = the distance in feet between the outer axles of any group of two or more consecutive axles.
N = the number of axles in the group under consideration.