N.J. Stat. § 39:4-40
The driver of a vehicle shall not overtake and pass upon the left, a street car proceeding in the same direction, whether actually in motion or temporarily at rest, when a travelable portion of the highway exists to the right of the street car, even though that portion of the highway is occupied by traffic, but this provision shall not apply to one-way streets.
The driver of a vehicle overtaking a street car, stopped for the purpose of receiving or discharging a passenger, shall bring the vehicle to a full stop, at least ten feet in the rear of the nearest entrance or exit of the street car then in use, and shall remain stationary until the passenger has boarded the car or reached the adjacent sidewalk. Where a safety zone has been established, a vehicle if otherwise permitted to proceed need not be brought to a full stop before passing the street car but may proceed past the car at a speed not greater than is reasonable and proper and with due caution for the safety of pedestrians.
N.J.S. § 39:4-40