LEGAL LIMITATIONS AND DEPARTMENT REGULATIONS Department Regulations
Axle Weight Distribution
The law requires reasonable distribution of axle weight on tandem, tridum, and quadrum axle groups. Those vehicles and loads with permits that exceed the legal axle weight must comply with the axle weight distribution as described on page 29. All other vehicles and loads must comply with the following:
Tandem Axles
1. On Interstate highways a tandem axle group is properly distributed if neither of the individual axles carries more than 20,000 pounds.
2. On non-Interstate highways a tandem axle group is properly distributed if neither of the individual axles carries more than 21,500 pounds.
Tridum Axles
1. On Interstate highways a tridum axle group is properly distributed if none of the individual axles carries more than 16,000 pounds.
2. On non-Interstate highways a tridum axle group is properly distributed if none of the individual axles carries more than 17,000 pounds.
Quadrum Axles
1. On Interstate highways a quadrum axle group is properly distributed if none of the individual axles carries more than 14,500 pounds.
2. On non-Interstate highways a quadrum axle group is properly distributed if none of the individual axles carries more than 15,500 pounds.
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