What lights should you use when driving in fog?

When driving in fog, it is essential to use low beam headlights. This is because fog can reflect light as well as scatter it, which makes high beam headlights less effective and can actually create a glare that reduces visibility even further. Low beam headlights are designed to provide a wider, shorter beam of light that illuminates the road immediately in front of the vehicle without contributing to the backscatter in fog.

Using emergency flashers is inappropriate as they signal to other drivers that your vehicle is stationary or experiencing an issue, not that you're driving. Parking lights are designed for use when a vehicle is parked and are not strong enough to adequately light the road. Thus, in adverse weather conditions, particularly fog, employing low beam headlights is the safest practice to enhance visibility while minimizing glare.