How to Drive Safely in Fog
In fog, slow down, use low-beam headlights so your taillights are on, use fog lights if equipped, and never use high beams because reflected light can worsen glare. Leave extra following distance and move to a protected location if you cannot see enough road to stop safely.
What to check and why
Select low beams
Turn on low-beam headlights even in daytime; use fog lamps too if equipped. Why: Low beams help others see your vehicle and activate the taillights. High beams reflect from fog droplets and can make it harder to see.
Clear the glass
Use the defroster, climate control and wipers as needed; clean the inside and outside of the windshield. Why: Moisture and grime compound the visibility loss caused by fog.
Slow before the fog
Ease off the accelerator before entering a dense patch and avoid sudden braking. Why: You need to be able to stop within the road distance you can actually see.
Use road markings
Guide your position with the right edge line and lane markings without staring at them. Why: Following another vehicle's taillights too closely can pull you into an unsafe speed and distance.
When to get professional help
- Headlights, taillights or hazard lights do not work
- Wipers smear or skip after cleaning
- Defroster cannot keep the windshield clear
- Windshield damage distorts light and visibility
If conditions become unsafe
If no protected stopping place exists, pull as far off the roadway as possible. Once stopped, set the parking brake and use hazard flashers. Follow local emergency guidance and avoid presenting steady taillights that could cause another driver to follow you off the road.
Frequently asked questions
Should I use high beams in fog?
No. The National Weather Service says high beams reflect from fog and create glare. Use low beams and fog lights if equipped.
Should I use hazard lights while driving in fog?
Laws and guidance vary. The National Weather Service specifically recommends hazard lights when pulling into a safe location in extremely dense fog; follow local law while moving.
When is fog too dense to keep driving?
If you cannot see enough roadway to stop within the visible distance, reduce speed and leave the roadway at the first protected location.