How many rear fog lights does a car have?

[AylaMarie]

A car can have one or two rear fog lights. National standards stipulate that the number of rear fog lights can be either one or two. If there is only one rear fog light, it must be installed on the left side. Generally, fog lights are red or yellow because these two colors have longer wavelengths and stronger penetration. Front fog lights are usually yellow for better penetration, while rear fog lights are typically red to serve as a warning signal for vehicles behind. A rear fog light is a red signal light installed at the rear of a vehicle to make it more visible to other road users in low-visibility conditions such as fog, snow, rain, or dust. It emits a stronger light intensity than the tail lights.