How to drive safely through flood water

A flood sign next to a flooded road

Pay attention to flood signs if you see them

Heavy rain makes driving more dangerous, especially when there’s flood water on the roads. 

75% of drivers say they would drive through flood water

Just 300mm of water is enough to float a car, yet research from the AA and the Environment Agency shows that many drivers are not aware of this danger. Instead, they will drive through flood water rather than finding an alternate route. 

Caroline Douglass of the Environment Agency said: “It is concerning that so many drivers are willing to risk their own life and the lives of others by driving through flood water.” 

Flood water can be deeper than it looks. It can also hide things you otherwise wouldn’t drive over such as broken road surfaces or debris. Some flood water can be deep enough that it hides broken tree branches on the road, which can cause irreparable damage to your car. 

How to drive through shallow flood water

You should always avoid driving through flood water whenever possible. but if the water is shallow enough, there are several tips to follow to make sure you’re safe. 

  • Allow oncoming traffic to pass before you drive through the flood water 
  • Drive along the highest part of the road, usually the centre. Keep an eye out for other drivers doing the same thing 
  • Go slowly but keep a steady speed 
  • Use first gear and keep the revs high 

Once you’ve made it through the flood water, check to make sure your brakes are working before continuing your journey.  

If your engine cuts out after driving through flood water, don’t attempt to restart it. Pull over if possible and call your emergency breakdown service and wait for help. 

Never attempt to drive through fast moving flood water. 

Flood water facts from the AA

  • Most drowning deaths happen within three metres of a safe point 
  • Two-thirds of people who die in flood-related incidents are good swimmers 
  • Just 150mm of fast-flowing water can knock you off your feet 
  • If the speed of the water doubles, the force it exerts on you and your car goes up four times 
  • Flood water can carry diseases 

 It’s very important to remember this advice before deciding if its worth attempting to drive through flood water. 

Check out our blog on tips to keep you safe while driving this winter if you’d like more information. 

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