New Jersey Statutes Title 39. Motor Vehicles and Traffic Regulation 39 § 4-125

The driver of a vehicle shall not turn such vehicle around so as to proceed in the opposite direction upon any curve or upon the approach to or near the crest of a grade or at any place upon a highway as defined in R.S. 39:1-1 where the view of such vehicle is obstructed within a distance of five hundred feet along the highway in either direction; and no such vehicle shall be turned around so as to proceed in the opposite direction on a highway which shall be conspicuously marked with signs stating “no U turn”.