Fog lights are used with other vehicle lighting in poor weather such as thick fog, driving rain or blowing snow. Because fog is made up of water droplets suspended in the air it can reflect headlights back into your eyes at night. In such conditions, fog lights can help drivers see further ahead and illuminate the road’s edges at reasonable speeds and are used with park lights instead of headlights.
Most fog lights have yellow colored reflectors, although more recently white fog lights are also used. These typically they use quartz halogen bulbs. Fog lights are available in different shapes and sizes.
Fog lights are usually mounted lower then headlights and tend to be aimed to strike the road a short distance in front of the vehicle. The light from the fog light is then reflected up into the fog. This reduces the light reflected into the driver’s eyes, providing better visibility.
Fog lights will normally be wired with a relay and circuit breaker. The method of connection of fog lights will depend on local regulations. They may be wired to work only with park lights and to turn off when headlights are used. The body control unit normally controls the function of the fog lights when fitted as original equipment.
