New Zealand Legislation: Regulations
Regulations are laws made under Acts
An advertisement of a specified kind that is erected on any road or in any place visible from a road must not—
(a) be made of, or have affixed to it, any reflective material that is likely to reflect the light from the headlights of any approaching vehicle:
(b) be internally illuminated by any means:
(c) be externally illuminated by any artificial lighting that is designed specifically to illuminate the advertisement.