New Jersey Statutes 39:4-183.11. Illumination; reflectorization
All illumination shall normally be by white light, except that a flashing light incorporated in a sign installation shall be yellow when displayed with a warning sign or red when displayed with a stop sign, and shall be provided by means of:
(a) A light, within or behind the sign, illuminating the main message or symbol, or luminous tubing shaped to the lettering or symbol;
(b) An attached or independently mounted flood light or flood lights, directed on the face of the sign.
Reflectorization of traffic signs shall reflect white light, except that if a reflecting coating is used as a background of a yellow sign it shall reflect yellow light, and shall be provided by means of:
(a) Reflector buttons or units set into the symbol or message;
(b) Reflecting coatings, either on the sign background or, where a black background or panel is used, in the symbol or message.
L.1941, c. 345, p. 907, s. 12. Amended by L.1951, c. 23, p. 105, s. 87.