Final answer:
When driving in fog, it is best to avoid using high-beam headlights due to the glare caused by their intense light reflecting off the water droplets in the fog. Low-beam headlights or fog lights should be used instead for better visibility.
Step-by-step explanation:
When driving in fog, it is not recommended to use high-beam headlights. This is because the high-beam headlights produce a bright and intense light that reflects off the water droplets in the fog, creating a glare and reducing visibility. Instead, it is best to use low-beam headlights or fog lights, as they are designed to provide a wider and shorter beam of light that illuminates the road without causing excessive glare.
Slow down and allow extra time to reach your destination. Make your vehicle visible to others both ahead of you and behind you by using your low-beam headlights since this means your taillights will also be on. Use fog lights if you have them. Never use your high-beam lights.
Travelling in fog can be extremely dangerous. Fog can drift rapidly and is often patchy. Warnings of dense fog are issued when visibility is expected to fall below 200 metres. Severe disruption to transport occurs when the visibility falls below 50 metres.