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Fog lights are specialized luminaires designed to improve visibility in conditions of reduced visibility, such as fog, heavy rain, or snow. They are typically mounted low on the vehicle, below the headlights, and emit a wide, flat beam of light that illuminates the road surface without reflecting back off the fog or other particles in the air. Fog lights are often used in conjunction with the vehicle's regular headlights, but may be used alone in certain conditions. They are an essential safety feature for drivers who frequently encounter poor visibility conditions, and can help to prevent accidents by improving the driver's ability to see and be seen.