N.J. Stat. § 39:4-1
The provisions of this chapter applicable to the drivers of vehicles on the highways shall also apply to the drivers of all vehicles owned or operated by this State, the United States, any territorial or Federal district, any other State or any county, municipality or any other political subdivision thereof, subject to such specific exceptions as are set forth in this chapter.
The provisions of this chapter shall apply to the owners and drivers of vehicles on highways, roadways, driveways, parking areas or upon any grounds owned and maintained by the State of New Jersey, or any State department or agency, the counties, the municipalities and the school district boards of education of this State.
This chapter shall not apply to persons, teams, motor vehicles and other equipment while actually engaged in work on the surface of a highway, but shall apply to such persons and vehicles when traveling to or from the work.
N.J.S. § 39:4-1