RSA 266:18-b Weight on Non-Interstate and General Highway System for Vehicles With Additional Registration.

The provisions of this section shall only apply to vehicles or combinations of vehicles which have been certified pursuant to RSA 266:18-d and shall only apply to the driving of such vehicles on any way other than the interstate and defense highway system. The driving of any such vehicle exceeding the limitations of this section is hereby prohibited; provided, however, that any police officer shall allow on any way other than the interstate and defense highway system a tolerance of 5 percent above said limitations and 10 percent above said limitations on the axle weights.
I. The maximum gross weights allowable for tires shall be the manufacturer's load rating for the tire.
II. Maximum axle weights allowable:
(a) 22,400 pounds per axle on 3-axle single unit vehicles