Most of your driving happens on dry roads with clear vision, so it's easy to build habits that only work in perfect conditions. Weather quietly removes those margins. Rain, ice, fog, wind and low sun each attack either your grip or your sight — sometimes both at once — and the driver who plans for that stays calm while others get caught out.
The single biggest adjustment is distance. Wet roads roughly double your stopping distance, and ice or packed snow can multiply it by up to ten. That isn't a small tweak to your following gap; it's a completely different amount of room. When you can't be sure of the grip, you leave more space and slow down before you need to, not after.
The second adjustment is being seen and seeing. Dipped headlights, a clean windscreen and the right use of fog lights make you visible without dazzling anyone. Everything in this guide comes back to those two ideas: buy yourself distance, and protect your vision. Master them and bad weather becomes an inconvenience rather than an emergency.
Study time
36 min
Level
Advanced
Confidence
+10%
Practice
34 Qs
What you'll be able to do
- Understand why bad weather stretches your stopping distance so much — and the simple rule that keeps you safe in it.
- Understand which lights to use in rain, fog and gloom — and the one fog-light rule that catches people out.
- Understand how to handle the weather that isn't rain — gusts, dazzling sun, and water across the road.
The facts that matter
- Wet roads roughly double your stopping distance; ice or snow can multiply it by up to ten.
- Aquaplaning means your tyres are riding on water — ease off the accelerator, keep the steering steady, don't brake hard.
- In fog, slow down, leave a bigger gap, and use dipped headlights — never main beam, which reflects back at you.
- Fog lights are only for visibility below 100 metres; switch them off once it lifts so you don't dazzle others.
- In heavy rain aim for at least a four-second gap, use dipped headlights, and watch for spray hiding hazards.
Make it stick
Memory anchors
Double, then ten
Wet doubles your stopping distance; ice can times it by ten. If you can't judge the grip, assume the worst and leave far more room than feels necessary.
Ease, don't seize
If the steering goes light and quiet in standing water, you're aquaplaning. Ease off the accelerator and hold the wheel still — braking or grabbing at the wheel is what turns it into a skid.
Below 100, lights on — above 100, off
Fog lights belong to thick fog under 100 metres. The moment you can see further, turn them off, or you become the dazzle you were trying to avoid.
Stay sharp
The mistakes everyone makes
Leaving fog lights on after the fog
Rear fog lights are as bright as a brake light. Left on in clear conditions they hide your actual braking and dazzle the driver behind. Switch them off as soon as visibility improves — it's a legal requirement, not just courtesy.
Braking hard when aquaplaning
When tyres lose contact with the road, the brakes have nothing to bite on and a hard stab just locks the wheels. The fix is patience: lift off the accelerator, keep the wheel steady, and let the tyres find the road again before you slow down.
Trusting a following gap that was set on a dry road
A two-second gap is a dry-road figure. Keep it in the rain and you've halved your real safety margin; keep it on ice and it's almost meaningless. The gap has to grow with the weather, every time.
Out on the road
What this looks like in real life
The exposed motorway bridge in a crosswind
You're passing a high-sided lorry as the road lifts onto a bridge. The wind that was blocked by the embankment suddenly hits both of you. Because you left extra room and eased your speed before the bridge, the buffet is a nudge you correct calmly rather than a lurch toward the next lane.
Low winter sun on the school run
It's four o'clock in January and the sun sits right at eye level. Your visor is down, the inside of the windscreen is clean so it doesn't smear into glare, and you've dropped your speed because you know the driver ahead is just as blinded as you — and so is anyone stepping off the kerb.
Go deeper
Lessons on this topic
Know the signs
Signs worth knowing here
Quick answers
Frequently asked questions
When am I allowed to use fog lights?
Only when visibility drops below 100 metres — roughly the length of a football pitch. They cut through thick fog, heavy rain or snow. As soon as conditions improve you must switch them off, because they're bright enough to dazzle and mask your brake lights.
What should I do if my car starts to aquaplane?
Ease gently off the accelerator, keep the steering wheel steady, and avoid braking hard. The tyres are riding on water, so any sudden input can cause a skid. Let the car slow naturally until the tyres grip the road again, then continue calmly.
How much bigger should my gap be in the wet?
Aim for at least a four-second gap in heavy rain, double the usual dry-road two seconds. On ice or snow you need far more still, since stopping distances can be up to ten times longer. When in doubt, drop back further than feels necessary.
How do I drive through a flood safely?
Avoid it if you can. If you must cross, wait your turn, drive slowly in a low gear to avoid stalling, and keep the engine revs up. Once through, test your brakes gently at low speed — wet brakes are weaker until you've dried them out.
Why do crosswinds matter so much for some vehicles?
High-sided vehicles, caravans, cyclists and motorcyclists all present a large area for the wind to push against, so a gust can shove them sideways in an instant. Give them plenty of room, especially on exposed roads and bridges where the wind hits hardest.
Turn weather and road conditions into marks
Reading builds understanding — practice makes it stick. Pick up where this guide leaves off, free.
Revision checklist
0/5Tick each point once you can explain it without looking.