N.J. Stat. Ann. § 40:67-16.1

The governing body of any municipality may, by ordinance, establish a system of truck routes in such municipality, subject to the provisions of this act. Any such ordinance may provide that all trucks having a total combined gross weight of vehicle plus load, in excess of four tons, shall be excluded from all streets in such municipality, except from those streets which form a part of the system of truck routes upon which trucks are permitted to travel and operate, which should be designated in the ordinance.