How to drive in heavy rain and flooding: tips for driving in wet road conditions

How to drive in heavy rain and flooding: tips for driving in wet road conditions
How to drive in heavy rain and flooding: tips for driving in wet road conditions

Parts of the UK are already being battered by high winds and heavy rain and the bad news is that there’s more to come.

The Met Office is predicting that heavy rain will sweep up and down the country over the coming days, presenting challenging road conditions.

Wet weather causes problems with visibility but also poses more serious risks to drivers with decreased grip and deep puddles which can cause drivers to lose control or damage cars.

The RAC has found that one in 20 drivers’ cars have broken down after driving through floodwater and seven per cent of those were so badly damaged that they were written off.

With that in mind, here are our tips for staying safe and protecting your car when the weather turns against you.

Driving in heavy rain

The first thing to do if you’re caught in heavy rain is to slow down and leave more space to the vehicle in front. Stopping distances as much as double in the wet due to a reduction in grip so you need to give yourself more time and space.

Put on your headlights. Heavy rain and spray reduces visibility for all road users. It’s important to put your headlights on not only to aid your vision but also to make your car more visible to other drivers. The Highway Code says you must use your headlights when visibility is less than 100 metres. Be careful about using fog lights, rear fogs can out-shine brake lights due to the glare and reflection from spray.

rain through car window
Stopping distances are much longer in wet weather (Photo: Shutterstock)

Be wary of puddles and standing water. What might look like a minor puddle at the side of the road could be hiding a deep pothole or dislodged drain cover that could cause serious damage to your car. Driving through even fairly shallow puddles could also cause aquaplaning, where your tyres’ tread is overwhelmed by the volume of water and they completely lose contact with the road. You’ll feel this as a lightening of the steering.

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Driving through flood water

Avoid it if you can. When faced with a seriously flooded road first check if there’s an alternative way round. Even a long detour is preferable to tackling a dangerously flooded road.

If you have to drive through a flood first check how deep the water is. Get out and check, preferably using a stick to gauge the depth. Remember as little as six inches of flowing water could knock you off your feet, so take care. According to the AA, just a foot of moving water will float a car and two feet of standing water is enough to do the same. It recommends that you shouldn’t try driving through anything more than four inches.

If you’ve determined it’s safe to proceed take it slowly and stick to the centre of the road. The crown, as it’s know, is the highest point so should be the shallowest section of the flood.

Don’t stop. Maintain a steady slow speed (3-4mph) and don’t change gear. If you need to, slip the clutch to keep revs up and speed down. In an automatic try braking gently while maintaining pressure on the accelerator. Moving slowly will help create a small bow wave which will stop the engine bay flooding. Stopping could flood the engine bay or could allow water to flow into the exhaust pipe – both of which are bad news.

car in flood
The best way to stay safe is to avoid flooded routes altogether (Photo: Shutterstock)

Be aware of other vehicles and pedestrians. You don’t want to soak pedestrians or potentially flood or damage anyone else’s car.

If you do get stuck, it’s usually safest to remain in the car and call for help. Obviously, you need to use your common sense as to whether this is the best option depending on your circumstances.

Once you’re clear of the flood dry your brakes. Apply them gently while driving slowly to remove the water from them.

Remember, modern cars are full of complex electrical systems which are vulnerable to water damage. Rushing through a puddle that forces water into the engine bay or wading into a deep flood could quickly cause expensive damage. Last year the AA rescued almost 9,000 vehicles that had driven through or were stuck in flood water, with an estimated insurance bill of more than £34 million.

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