New Jersey Statutes Title 39. Motor Vehicles and Traffic Regulation 39 § 4-119

a. Flashing red: The red lens when illuminated with rapid intermittent flashes shall require drivers to come to a complete stop before entering or crossing the intersection. The driver shall proceed only after yielding the right of way to all traffic on the intersecting street, which traffic is so close as to constitute an immediate hazard.

b. Flashing amber: The amber lens when illuminated with rapid intermittent flashes shall indicate the presence of danger and require drivers to proceed only with caution.