N.J. Stat. § 39:4-121.1
Any county or municipality, wherein a dangerous intersection has been established by reason of the construction of a State highway within the territorial limits thereof, may apply to the State Highway Commissioner for the installation and maintenance of traffic lights at such intersection, and after an application is so made the commissioner shall cause to be made a proper investigation and survey concerning the traffic hazards which exist at such intersection. The State Highway Commissioner, after an investigation and survey, may install and maintain traffic lights at any intersection where an application, as hereinbefore provided for, has been made, but the installation of any traffic lights pursuant to this section shall receive the approval of the director.
N.J.S. § 39:4-121.1