Fog lights are specifically designed for use in poor visibility conditions, such as dense fog, heavy mist, or similar weather. They are not meant for everyday use or as a substitute for regular headlights. Using fog lights in clear conditions can cause unnecessary glare for other drivers. Always consult your vehicle's manual and follow local regulations regarding fog light usage. Remember to turn off rear fog lights when visibility improves, as their brightness can obscure brake lights for drivers behind you.