How to Drive in Heavy Rain and Avoid Aquaplaning

Heavy rain changes three things at once: how far you can see, how long it takes to stop, and whether your tyres stay in contact with the road at all. The first two you manage by slowing down and leaving a bigger gap. The third is aquaplaning, and it can happen to any driver on any road once standing water builds up faster than the tyres can push it aside.

The core advice is short. Slow down, and increase the gap between you and the vehicle in front to at least four seconds¹. Use dipped headlights, even in daylight, so other drivers can see you². If the car starts to float, hold the steering wheel lightly and lift off the throttle until the tyres regain grip³. And if you cannot see, pull over⁴.

Everything else on this page is the detail behind those four actions: what aquaplaning feels like, why wet roads take so much longer to stop on, where the surface is more slippery than it looks, and what to do when a flood warning is out and the car is parked in the wrong place.

Slow down and double your distance from the car in front

Wet roads take longer to stop on, and the faster you are going the more room you need. Official guidance is consistent on this: reduce your speed and leave more space between you and the vehicle in front, because stopping distances in rain are increased⁶. Several fire and rescue services put it more simply: double the distance between your car and the car in front, as stopping distances are increased by wet roads⁸. National Highways gives a figure to aim at: increase the gap to at least four seconds¹.

Why the gap matters more than usual: stopping your vehicle during rain or wet conditions can take up to four times longer, and you can quickly lose control⁵. That is the difference between a near miss and a collision. It takes a lot longer to stop when the road conditions are wet⁹.

A four second gap is easy to check. Pick a fixed point ahead, such as a bridge or a sign. When the car in front passes it, count "one thousand and one, one thousand and two" and so on. If you reach the point before you finish four, you are too close.

• Reduce speed before the surface changes, not after⁶
• Leave at least four seconds to the vehicle in front¹
• Double the normal gap as a rule of thumb on wet roads⁸
• Brake earlier and more gently than you would in the dry¹⁰

The same advice holds across the UK. Traffic Wales tells drivers to reduce speed and leave plenty of distance between their car and the one in front⁵. Traffic Scotland advises using dipped headlights during daylight hours, slowing down and keeping a safe distance from the vehicle in front¹¹. In Northern Ireland, the Highway Code rules on adverse weather apply in the same way¹².

Use dipped headlights, even in daylight

Visibility will probably be reduced in rain, so use dipped headlights¹³. This is not about seeing better yourself, though it helps. It is about being seen. Use dipped headlights when driving during periods of rain, fog or snow¹⁴, and use headlights whenever visibility is reduced, for example early morning, at dusk, when it is raining or in any gloomy conditions¹⁵.

Use dipped headlights if visibility is seriously reduced¹⁶. Ceredigion County Council adds a practical point for wet weather: use dipped headlights when driving in rain, snow or fog, and always keep plenty of fuel in the tank¹⁷.

If you are unsure when fog lights are appropriate, our guide to when you should use fog lights sets out the conditions.

Avoiding aquaplaning: low speed and no hard braking

Aquaplaning happens when water builds up in front of your tyres faster than the weight of your vehicle can displace it, pushing water under the tyre and creating a thin layer between the rubber and the road surface⁷. The tyres lose grip, and you may be unable to steer, brake or accelerate⁵. It is caused by driving too fast into surface water¹³.

The signs are distinctive. You may hear your engine suddenly become louder, feel as though you have dropped the clutch down gears while driving at speed, feel the steering become light, or experience the back end of the car drifting from side to side, known as fishtailing¹.

If it happens, National Highways advises: don't hit the brakes hard, gently ease off the accelerator, hold the steering wheel straight, switch off cruise control if it is on, and begin to brake once the vehicle begins to gain control⁷. Cheshire Fire and Rescue Service puts it slightly differently: hold the steering wheel lightly and lift off the throttle until the tyres regain grip³.

To avoid it in the first place, slow down and prepare for the risk of sudden areas of standing water, and ensure that your tyres are in excellent condition¹⁵. Having the correct tyre pressure and tyre tread depth will maximise your tyres' ability to maintain their road grip¹³. Even the most modern road surface is susceptible to standing water in heavy downpours, creating a potential aquaplaning hazard as well as significantly reducing visibility³.

If you do have to drive through floods, drive slowly using first gear and try to keep the engine revving at a high rate, moving forward continuously to avoid stalling; in an automatic, engage and hold in a low gear; check your mirror and test your brakes afterwards¹⁸. But the better answer is not to drive into flood water at all.

When to pull over because you cannot see

If heavy rain is making visibility difficult, pull over if possible⁴. That is the straightforward rule from Dorset and Wiltshire Fire and Rescue Service, repeated in their flood guidance¹⁹. The Met Office adds a planning point: if heavy downpours are expected, avoid starting your journey until it clears¹⁶.

If hail is severe, stop driving and pull over to a safe, preferably sheltered area, such as under an overpass or onto a hard shoulder²⁰. The Met Office says the same: if hail is severe, stop and pull over to a safe place and remain inside the vehicle¹⁰.

Where to stop matters. A hard shoulder is for emergencies, and stopping under a bridge or overpass puts you in a place where other drivers may not expect you. If you must stop, get as far from the carriageway as you safely can, keep your seatbelt on, and put your hazard lights on. If you are on a motorway, National Highways advises going left to the hard shoulder or an emergency area and calling for help.

For more on planning around bad weather, see our guide to whether you should delay your journey and the wider driving in snow and ice page.

Where the road is more slippery than it looks

Some surfaces catch drivers out even when the rain does not look heavy. Spilt diesel is one. Be aware of the dangers of spilt diesel that will make the surface very slippery¹⁵. Spillages on road surfaces, particularly diesel, create slippery conditions that are a major hazard to other road users²¹. You will not see it in the wet, so the only defence is speed and gentle controls.

The first rain after a dry spell is another. The Highway Code warns that the road surface may become soft or, if it rains after a dry spell, it may become slippery, which could affect steering and braking². Oil and rubber that have built up on the surface lift into a film when the first rain arrives.

Freezing rain and black ice are a third. In freezing rain, keep your distance and reduce speed, because black ice is difficult to see and conditions can be slippery even when they seem normal²².

On any slippery road, travel slowly and at a safe distance from the vehicle in front, use dipped headlights if visibility is poor, avoid sudden or harsh braking, steering and accelerating to prevent skidding, and use all controls very gently¹⁰. It takes much longer to stop on slippery roads¹⁰.

Parking and driving when a flood warning is out

If a flood warning is in force, the first thing to do with the car is move it. Park your car outside the flood zone²³. Move vehicles to higher ground²⁴. Do not wait until water is on the road outside.

The same advice appears in thunderstorm guidance: park your car outside the flood zone²⁵. If you are caught in a thunderstorm while driving, the safest place is inside the vehicle with the windows closed.

If you have to drive through floods, drive slowly using first gear and keep the engine revving at a high rate, moving forward continuously to avoid stalling; in an automatic, engage and hold in a low gear; check your mirror and test your brakes afterwards¹⁸. But this is a last resort, not a plan.

For the household side of flooding, including what to do before, during and after, see our flooding guide. For weather warning levels, see Met Office weather warnings explained.

Heavy rain in mid and west Wales, and autumn and winter driving

Heavy rain is a common issue in mid and west Wales, especially during the autumn and winter months¹⁵. The Welsh language version of the same Mid and West Wales Fire and Rescue Service guidance says the same: heavy rain is a common event in Mid and West Wales, especially in autumn and winter²⁶. Their seasonal safety page repeats it: heavy rain is a common issue in Mid and West Wales, especially during the winter months²⁷.

If you live in or travel through mid and west Wales, treat wet roads as the normal winter condition rather than the exception. Check the forecast before setting out, allow more time, and expect standing water on routes you know well.

Across the UK, roads can be affected by adverse weather, particularly in winter, when snow, ice, heavy rain and strong winds create difficult driving conditions²⁸. Hail, heavy snow and rain reduce visibility²⁹. The broad instruction from the fire and rescue service is to drive appropriately in severe weather conditions³⁰.

Autumn and winter bring the worst of it, but heavy rain can arrive at any time of year. The preparations are the same: check your tyres, lights and brakes before the season starts, keep plenty of fuel in the tank¹⁸, and carry a few basics in case you are stopped for a while.

For the full seasonal checklist, see car checks before winter and what tyre tread depth you need. If you are driving in snow rather than rain, our guide to driving in snow and ice covers the differences.