N.J. Stat. § 39:3-80
Any person who shall operate an automobile, commercial vehicle, trailer or semitrailer or tractor not equipped on all wheels with rubber tires or tires, of a material other than rubber which have been approved by the commissioner, or who shall operate a commercial vehicle, trailer, semitrailer or tractor equipped with solid rubber tires impaired to such an extent as to be likely to cause damage to the public highways, shall be fined, in either case, not less than fifty dollars ($50.00) nor more than one hundred dollars ($100.00) for the first offense, and for any subsequent offense not less than one hundred dollars ($100.00) nor more than two hundred dollars ($200.00).
Tractors used for agricultural purposes may be operated over the highways of this State without being equipped with rubber tires, under such regulations as shall, from time to time, be adopted by the commissioner.
Traction or tractor well-drill machines or well-drilling equipment may be operated on the highways as provided by section 39:3-26 of this Title.
N.J.S. § 39:3-80