N.J. Stat. § 39:3-54.9: Specifications.

3. Emergency warning lights shall be removable or permanently attached, of the flashing or revolving type, equipped with a blue lens and controlled by a switch installed inside the vehicle or shall be blue of the light bar type, in accordance with the specifications prescribed by the chief administrator.

L.1977,c.223,s.3; amended 1979, c.71, s.2; 2005, c.218, s.2.