Arizona Driving Permit Written Practice Test

Fog lights are specifically designed to illuminate the road immediately in front of your vehicle in conditions with low visibility, such as during fog, heavy rain, or snow. These types of weather conditions can cause standard headlights to reflect off the moisture in the air, creating a glare that can actually reduce visibility. Fog lights, positioned lower on the vehicle and emitting a wide, bar-shaped beam, help penetrate the fog or heavy precipitation without causing as much reflection. This makes it safer to drive and helps the driver see the road more clearly as well as makes the vehicle more visible to other drivers. Using fog lights during bright, sunny weather, at night, or when there are no street lights does not enhance visibility in the same way and can even be distracting or blinding to other drivers. Hence, the correct conditions to use fog lights are during fog, heavy rain, or snow.