definition
strict definition
vehicle warning lights
Lights fixed to an object to warn passing or approaching vehicles of its presence and reduce collision risk.
Vehicle warning lights on a place or structure are lights attached to that object for the purpose of warning passing or oncoming vehicles not to collide with it.
The lights are attached to the place or structure being marked. They identify that object as a potential obstruction to nearby vehicles.
The warning purpose distinguishes them from ordinary decorative lighting. No particular color, flash sequence, or mounting shape is required by this definition.