What is the purpose of car fog lights?

[DelMadison]

Car fog lights are used for road illumination during rainy or foggy weather conditions. They can penetrate thick fog and serve to alert oncoming drivers, making it easier for drivers behind to spot your vehicle. They are primarily used in environments with low visibility such as fog, snow, rain, or dust. Fog lights can increase the operational distance. In foggy conditions where visibility is low and the driver's line of sight is restricted, the strong light penetration of yellow anti-fog lights can enhance visibility for both the driver and other traffic participants, allowing approaching vehicles and pedestrians to detect each other from a greater distance. Fog lights should only be turned on when visibility is below 200 meters.

[SanWalter]

I've always found fog lights quite useful when driving, especially in foggy, rainy, or snowy conditions with low visibility. The front fog lights are positioned low, with their beams not pointing upwards, which helps reduce light reflection in the fog, allowing you to see the road ahead more clearly. The rear fog lights are a bright red color, making it easier for vehicles behind to notice you and preventing rear-end collisions. I remember once encountering heavy fog on the highway—without the fog lights, I could barely see the road signs, but turning them on instantly made me feel much safer. However, don't misuse fog lights in clear weather or normal road conditions; they can be dazzling and distract other drivers, which can be dangerous. Make it a habit to only use them in bad weather and regularly check if the bulbs are working to avoid failure at critical moments. These lights are specifically designed for low-visibility environments, being more focused than regular headlights and causing less interference.

[Freddie]

As a long-time safety-conscious driver, I believe the core function of fog lights is to ensure driving safety, especially in adverse weather conditions. They enhance vehicle visibility and help prevent collisions. For example, in thick fog, regular headlights can create a blinding white glare due to light reflection, whereas fog lights emit a lower, more penetrating light that doesn't dazzle. The red glow of rear fog lights stands out distinctly in fog, reducing the likelihood of rear-end collisions. I've experienced driving on highways during rain and fog, where turning on the fog lights made it much easier for oncoming vehicles to spot my position. The key is to only activate them when truly necessary, such as when visibility drops below 100 meters, as improper use can be counterproductive and may even result in fines. Regular checks on bulb conditions are essential to ensure they function reliably when needed most. Safety comes first, and fog lights are a practical design under this principle.

[SanEmma]

When I first started driving, I was curious about what fog lights were for, but now I understand: they mainly help you see the road and be seen by others in bad weather. In fog, heavy rain, or snow, fog lights work better than regular lights—they don’t dazzle and provide clearer visibility. The switch is usually near the steering wheel; look for the one with a fog symbol. Remember to turn them off after use and avoid using them in clear weather, as they can glare and cause trouble. Last time I tried them on a slippery road, the fog lights made the surface appear more stable. Simply put, they’re auxiliary lights for poor weather conditions.