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What Is Aquaplaning And How Do You Avoid It?

Thursday, 20 September 2018 at 16:11

Aquaplaning whilst driving

Aquaplaning - what it means, how it affects your car and what to do if it happens to you

The British weather being what it is, we're never far from a torrential downpour. With that comes the danger of standing water on the roads and with that comes the threat of your car aquaplaning.

You may have never been inside a car that's started aquaplaning before, let alone been at the wheel, but that doesn't mean it couldn't happen. The key thing is to be as prepared as you can be, understand what do you do if aquaplaning happens and, perhaps most importantly, how do you prevent it from happening in the first place. Our guide should provide the answers...

What is Aquaplaning?

Aquaplaning is a relatively simple concept. It occurs when a layer of water forms between the surface of your car tyres and the road surface, breaking the contact between your tyres and the road. When a car starts aquaplaning its tyres lose contact with the road and the car stops responding to control inputs such as braking, steering an acceleration.

As well as helping your car grip the road through corners, the grooves in your car tyres are designed to dissipate water that is on the road. If the volume of water on the road is greater than the volume of tread on your tyres, there will be a surplus of water which cannot be dissipated and the car can start to aquaplane.

Tyre safety experts, TyreSafe claim that a typical good condition tyre can remove enough water to fill a standard bucket in 7 seconds at its maximum performance. If that isn't enough, a surplus of water builds up in the front of the tyre and will reach a critical point. At this moment, the pressure from the water on the rubber will lift the tyre up, so that it is no longer in contact with the road and the car starts to aquaplane.

Aquaplaning predominantly affects the front wheels as the rears are usually trailing in the drier tracks left by the front tyres. This means that steering inputs will have no effect and, as a car's brakes are bias to the front, the majority of braking capability will also go. Drive will also be removed if you are in a front wheel drive car. If all four wheels are separated from the tarmac during aquaplaning, you will be moments away from losing control of your vehicle.

What to do if aquaplaning happens?

To set the scene, you are driving down the road and you see a large area of standing water. You drive over it and your car starts to aquaplane. For those who have not experienced this, it will take a second to realise what is happening but the tell tale signs are engine revs spiking (due to the reduced resistance required to make the wheels rotate) and the steering becoming much lighter (again, due to the reduced force required to turn the wheels).

As in so many situations, the worst thing you can do is panic. Mashing the brakes and twirling at the steering wheel will have little effect and could land you in far worst trouble if your car suddenly regains contact with the road.

What you should do is the following: If you are using cruise control turn it off using the switch, using the brakes at the point may upset the balance of the car and put you in a spin. Then gently lift of the throttle. As your brakes, steering, and acceleration are currently redundant, the only sensible thing to do is simply let the car slow down naturally. As the speed drops gently try the steering and if it appears to be biting, move onto applying the brakes. Gradually you will be able to regain control of your car, before stopping and realising that you need to now breathe.

If you car does not slow sufficiently to regain control or you are fast approaching a corner, there is very little you can do aside from keep trying the steering and brakes ensuring each time you are gentle and smooth.

What can you do to prevent it from happening?

When your car starts aquaplaning you effectively become a passenger so the best course of action is to prevent it happening in the first place.

There are a couple of golden rules to consider when trying to reduce the chances of aquaplaning happening. Firstly, be aware of the conditions. If there is standing water around or it starts to rain heavily, reduce your speed take extra care to avoid patches of road that look to be water-logged. Slowing down in wet conditions gives your tyres more chance to work, reduces any build-up of excess water and increases the amount of grip available.

After this, there is tyre condition. Excessively worn, or damaged tyres are less efficient at dispersing water from the road, with tyre safety experts TyreSafe saying that there is a significant drop off in a tyre's performance as it approaches the minimum legal limit. Ensuring there is ample tread and that tyres are inflated to the correct pressure goes a long way to improving your safety. Even though the minimum legal requirement is 1.6mm, leading safety experts to recommend a minimum of 2.5mm for winter driving and considering a set of winter tyres is another good idea.

If you can, it's also worth using the drier tracks left by the car in front of you. There will be significantly less water for your tyres to remove here but you must always maintain a safe distance. In wet weather, stopping distances increase dramatically.

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