New Jersey Statutes Title 39. Motor Vehicles and Traffic Regulation 39 § 4-128.4

a. The driver of a vehicle approaching or overtaking from either direction a frozen dessert truck stopped on the highway shall stop before reaching the truck when the flashing red lights and stop signal arm described in section 3 are in use. After stopping, a driver may proceed past such truck at a reasonable and prudent speed, not exceeding 15 miles per hour, and shall yield the right of way to any pedestrian who crosses the roadway to or from the frozen dessert truck.

b. The driver of a vehicle on a highway having dual or multiple roadways separated by safety islands or physical traffic separation installations need not stop upon meeting or passing a frozen dessert truck on another roadway.