What does contour light mean?

[LawsonRose]

Contour lights are the outermost lights at the front and rear of a vehicle. Large trucks also have contour lights on their roofs and sides. Literally, 'contour' means outline, and 'light' serves as a warning, so contour lights are warning lights used to alert other vehicles. They are installed along the edges of the vehicle's roof, indicating both the height and width of the vehicle. More about contour lights: Introduction: Contour lights, literally meaning outline warning lights, are warning lights used to alert other vehicles. Installation location: Installed along the edges of the vehicle's roof, indicating both the height and width of the vehicle. According to safety standards, vehicles taller than three meters must be equipped with contour lights. The color of contour lights is white at the front and red at the rear.