The fog light switch in a Buick car is located on the left side of the steering wheel, where there is a rotary light switch. Turning it to the fog light position will activate the fog lights. However, the prerequisite for turning on the fog lights is to first turn on the vehicle's lights, i.e., the small lights of the vehicle. When driving under adverse weather conditions such as fog, snow, heavy rain, or in environments filled with smoke and dust, front fog lights are essential to illuminate the road ahead and ensure the vehicle is visible to others, thereby enhancing driving safety. The light source of fog lights has strong penetration. In recent years, in terms of styling design, fog lights are often positioned on the front bumper. The visor inside the front fog light is designed to block the light from the filament that would otherwise reflect off the upper part of the reflector, creating a clear cutoff line in the light distribution—dark above and bright below. The upper edge of the light distribution pattern should be as dark as possible in the visible area, while the lower bright area should have a horizontal diffusion angle of 50° on both sides, forming a bright horizontal zone to provide good illumination conditions without causing glare. Fog lights are divided into front fog lights and rear fog lights. Front fog lights are typically bright yellow, while rear fog lights are red. The symbol for the rear fog light is slightly different from that of the front fog light—the lines of the front fog light symbol point downward, whereas those of the rear fog light are parallel. The rear fog light switch is usually located on the vehicle's instrument panel. In foggy conditions, both front and rear fog lights are generally used together. Vehicle lighting regulations: When visibility is between 200m and 500m, you must turn on the low beam lights, width lights, and tail lights, and the speed must not exceed 80 km/h. The distance from the vehicle in front in the same lane must be kept at more than 150m. When visibility is between 100m and 200m, you must turn on the fog lights, low beam lights, width lights, and tail lights, and the speed must not exceed 60 km/h, maintaining a distance of more than 100m from the vehicle in front. When visibility is between 50m and 100m, you must turn on the fog lights, low beam lights, width lights, and tail lights, and the speed must not exceed 40 km/h, maintaining a distance of more than 50m from the vehicle in front. When visibility is less than 50m, the public security and traffic management departments will implement traffic control measures, including partial or full closure of highways, in accordance with regulations.
