N.J. Stat. § 39:4-30
Nothing in this article shall apply to any road building machinery, vehicle, traction engine, steam roller or other apparatus or machinery running upon railroad or street railway tracks, or a private railroad or railway, spur track or switch, nor shall a license hereunder be required for any road building machinery, vehicle, traction engine, steam roller or other apparatus or machinery while actually used in any type of construction; provided, further, however, that any such road building machinery, vehicle, traction engine, roller or other apparatus or machinery of the kind may be operated or drawn, subject to the following conditions:
Any person, partnership or corporation may, with regard to such road building machinery, vehicle, traction engine, roller or other apparatus or machinery of the kind owned or controlled by it, obtain general registration and registration plates therefor of the style and kind provided for in this article, with the word "temporary" or "in-transit" stated thereon, but only if the director is satisfied as to the financial responsibility of such person, partnership or corporation to meet any claim for damages arising out of an accident and satisfactory evidence of such responsibility has been filed with him.
The annual fee for the issuance of a certificate of registration, or duplicates thereof and five sets of "temporary" or "in-transit" plates bearing a number, corresponding to the number on the certificate of registration shall be $100.00.
Such plates can be placed on any such road building machinery, vehicle, traction engine, roller or other apparatus or machinery, owned or operated by the person, partnership or corporation to whom the registration is issued, only in moving to and from the location of any type of construction.
N.J.S. § 39:4-30