Driving in heavy rain and floods can be particularly dangerous on UK roads. Reduced visibility, longer stopping distances, standing water and the risk of aquaplaning can all make it harder to maintain control of your vehicle.
Even experienced drivers can be caught out by sudden downpours, surface water or unexpected flooding. Knowing when to slow down, how to maintain a safe distance and when to avoid a flooded road can help protect you, your passengers and other road users.
The safest option during severe weather may be to postpone your journey altogether. If you do need to travel, checking your vehicle beforehand and adapting your driving to the conditions can make a significant difference.
In this guide, we’ll explain how to prepare for wet-weather driving, reduce the risk of aquaplaning, recognise the dangers of floodwater and respond safely if your vehicle becomes stranded.
For practical advice on checking your tyres, lights, windscreen wipers and other essential components, visit our car maintenance guidance hub.
Before You Set Off
Before setting off in heavy rain or severe weather, consider whether your journey is essential. If flooding, road closures or severe weather warnings have been reported along your route, postponing your journey may be the safest option.
If you need to travel, check the latest weather forecast, flood warnings and traffic information before leaving. Plan an alternative route in case roads become impassable.
Check Your Vehicle Before Travelling
A few simple checks can help reduce the risks associated with wet-weather driving:
- Tyres: Check that your tyres are correctly inflated and have sufficient tread. The legal minimum tread depth for most cars in the UK is 1.6mm across the central three-quarters of the tyre, around its entire circumference. More tread can help disperse water effectively.
- Windscreen wipers: Make sure your wiper blades clear the windscreen properly without smearing or leaving large areas of water.
- Screenwash: Top up the reservoir so you can clear dirt and spray from your windscreen.
- Lights: Check that your headlights, brake lights and indicators are working correctly.
- Heating and demisting: Ensure your ventilation system can clear condensation from the windows.
- Mobile phone: Charge your phone before travelling and carry a suitable charging cable.
It’s also sensible to carry appropriate warm clothing and essential supplies in case your journey is delayed.
Plan Your Route Carefully
Avoid roads known to flood and never assume that a familiar route will remain safe during heavy rainfall.
Check for official flood warnings, road closures and travel updates before leaving. Conditions can change quickly, so be prepared to turn back or find an alternative route.
If severe weather makes driving unsafe, find a suitable place to stop rather than continuing simply to reach your destination.
Driving Safely in Heavy Rain
Slow Down
Heavy rain reduces tyre grip and increases stopping distances. Driving more slowly gives you additional time to react to hazards, including standing water, poor visibility and sudden braking by other motorists.
Remember that the speed limit is a maximum, not a target. Even when you’re travelling within the legal limit, your speed may be inappropriate for wet or flooded road conditions.
Avoid harsh acceleration, sudden braking and sharp steering movements, particularly when travelling through areas of standing water.
Leave More Space
Wet roads can significantly increase the distance needed to stop safely.
The Highway Code recommends allowing at least twice the normal separation distance from the vehicle ahead when driving on wet roads. In particularly heavy rain or poor visibility, you may need even more space.
Maintaining a greater following distance gives you more time to recognise hazards and respond without sudden braking.
Use Your Lights
Use dipped headlights when visibility is reduced by heavy rain, even during daylight hours. This helps other motorists see your vehicle.
If visibility is seriously reduced, you may use your front or rear fog lights where fitted, but you must switch them off when visibility improves so they don’t dazzle other drivers.
Avoid using full-beam headlights when they could dazzle approaching motorists or reflect back from heavy rain and spray.
Don’t rely entirely on automatic headlights, as they may not activate in every situation where visibility is poor.
Watch for Spray
Large vehicles such as lorries, buses and coaches can produce substantial amounts of spray, temporarily obscuring your view of the road.
Increase your following distance when travelling behind larger vehicles and be particularly cautious when overtaking or being overtaken.
If spray suddenly reduces your visibility, ease off the accelerator and avoid abrupt steering or braking.
Motorways can be especially challenging during heavy rain because of higher traffic speeds and spray from multiple vehicles. For further advice, read our guide to staying safe on the motorway, including what to do if your vehicle breaks down.
Beware of Aquaplaning
Aquaplaning happens when a layer of water builds up between your tyres and the road surface, causing the tyres to lose grip. This can make steering, braking and accelerating much less effective.
The risk increases when driving at higher speeds through standing water, particularly if your tyres are worn or incorrectly inflated.
How to Recognise Aquaplaning
Warning signs may include:
- Steering suddenly feeling unusually light or unresponsive.
- The vehicle no longer responding normally to steering inputs.
- A sudden increase in engine revs on some vehicles.
- A feeling that the car is sliding or floating across the road.
What to Do if Your Car Aquaplanes
If you suspect your vehicle is aquaplaning:
- Remain calm and avoid sudden movements.
- Ease off the accelerator gradually rather than lifting off abruptly.
- Avoid harsh braking, which could make the vehicle harder to control.
- Keep the steering wheel steady, making only gentle corrections if necessary.
- Allow the tyres to regain contact with the road before making significant steering or braking inputs.
Once you’ve regained control, reduce your speed and increase your distance from other vehicles.
How to Reduce the Risk
Good tyre condition is particularly important in wet weather. Adequate tread depth helps tyres disperse water, while correct tyre pressures support their intended performance.
Avoid driving through standing water where possible, reduce your speed in heavy rain and be especially cautious where water collects in road depressions or wheel tracks.
If road conditions become too dangerous, find somewhere safe to stop and wait for conditions to improve.
Driving Through Floodwater
Floodwater can be extremely dangerous, even when it appears shallow or slow-moving. It can hide damaged road surfaces, open drains, debris and strong currents that are difficult to judge from inside a vehicle.
Never attempt to drive through floodwater if you cannot clearly assess its depth, the road surface or whether it is safe to proceed. The safest option is to turn around and find an alternative route.
Why Floodwater Is Dangerous
Floodwater presents several serious risks:
- Loss of control: Moving water can cause a vehicle to lose traction or be swept away.
- Engine damage: Water entering the engine’s air intake can cause severe mechanical damage.
- Hidden hazards: Potholes, damaged roads and displaced drain covers may be concealed beneath the water.
- Electrical problems: Floodwater can damage electrical systems and other vehicle components.
- Being stranded: Your vehicle could stall or become trapped as water levels rise.
Just 30cm of flowing water can be enough to move some cars, while deeper water can float or carry vehicles away. The precise danger depends on the vehicle, water speed and surrounding conditions.
What if You Encounter a Flooded Road?
If you approach a flooded section of road:
- Slow down safely and assess the situation from a safe distance.
- Obey road closure signs and instructions from emergency services.
- Never drive around barriers or enter a road that has been closed because of flooding.
- Do not assume that another vehicle crossing safely means yours can do the same.
- Turn around where it is safe and legal to do so, or find another route.
Avoid entering floodwater simply because it appears shallow. Water depth can change suddenly, and the condition of the road beneath may be unknown.
If Your Vehicle Becomes Stranded in Floodwater
If your vehicle stalls or becomes trapped in floodwater, prioritise your safety rather than trying to save the vehicle.
- Do not repeatedly attempt to restart the engine, particularly if water may have entered the air intake.
- Assess whether you can leave safely. Do not step into deep or fast-moving water.
- Call 999 if you or your passengers are in immediate danger, and follow the emergency operator’s instructions.
- If you are somewhere safe, contact your breakdown recovery provider and explain that the vehicle has been exposed to floodwater.
- Do not attempt to recover or move the vehicle yourself if doing so would put anyone at risk.
If water is rising around your vehicle, seek emergency advice immediately. Whether you should remain inside or leave depends on the conditions, including the water’s depth, speed and the availability of a safe escape route.
After a Vehicle Has Been Flooded
A vehicle that has been submerged or has taken in significant floodwater may have hidden mechanical, electrical or safety-related damage.
Avoid starting or driving it until a suitably qualified professional has assessed the vehicle.
Even if the engine runs, water damage can affect braking systems, electrical components and other essential equipment. A professional inspection can help determine whether repairs are safe and economically worthwhile.
Dry Your Brakes Afterwards
If you’ve driven through shallow standing water, your brakes may be less effective until they dry out.
Once you’re clear of the water, and only where road conditions make it safe:
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Reduce your speed and leave plenty of space between your vehicle and other road users.
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Test your brakes gently to check whether they’re responding normally.
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Apply the brakes lightly several times, if necessary, to help dry them.
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Stop somewhere safe and seek professional assistance if braking performance remains poor or you notice unusual noises, vibrations or warning lights.
Never test your brakes suddenly or sharply in moving traffic.
If your vehicle has been submerged or has taken in significant floodwater, don’t assume that drying the brakes makes it safe to drive. Arrange a professional inspection before using the vehicle again.
Take Your Time
Heavy rain and flooding demand patience, concentration and good judgement. Allow extra time for your journey, reduce your speed and stay alert to changing road conditions.
Remember that other drivers may react unpredictably in poor weather. Maintaining a safe following distance and avoiding sudden braking or steering can help reduce the risk of an accident.
If conditions become too dangerous to continue, find somewhere safe to stop and wait for the weather to improve. No journey is worth putting yourself or your passengers at risk.
Preparing your vehicle for changing seasons is equally important. As the weather turns colder, it’s worth getting your car ready for cooler weather so that your tyres, lights, battery and other essential components are ready for the conditions ahead.
Thinking About Replacing Your Car?
If your current vehicle is becoming unreliable or expensive to maintain, you may be considering a replacement.
Before making a decision, you can find out what your car is worth with Jamjar. Compare offers from UK car buyers and explore your options without the pressure of negotiating with individual dealers.
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