N.J. Stat. Ann. § 27:2-4

If a patented, proprietary pavement or paving material, or ingredients used in paving, is included in the specifications, the body having charge of the work shall not only specify such type of construction, but shall also place in the specifications one or more equivalent types of construction upon which no patent exists, or upon which there is no proprietary right or condition, as an alternate type, and bids shall be asked for on the various types so specified. The award shall be made to the lowest responsible bidder on the types of construction so placed in competition.