Mastering Driving in the Rain

Driving in wet and bad weather is one of the most common challenges UK drivers face, transforming a routine journey into a test of skill and vehicle readiness, especially after a very dry summer. Damp conditions significantly increase the risk of accidents and breakdowns, while flood damage from driving through deep water or puddles can lead to costly repairs to your engine, brakes, and electrical system. 

This guide will equip you with the essential knowledge to navigate rainy roads safely, from a light drizzle to heavy rain and flooding.

Precautions for Wet Weather Driving

Driving in heavy rain and wet weather brings a unique set of challenges that every motorist should be prepared for. Wet roads can quickly become slippery, and standing water or deep puddles may appear with little warning, increasing the risk of losing control. 

If you do need to drive in heavy rain, preparation is key. Check that your windscreen wipers are in good condition and working effectively, as clear visibility is crucial. Inspect your tyre tread depth; worn tyres struggle to grip wet roads and are more likely to lose contact with the surface, especially in deep puddles or standing water. 

Don’t forget to test your brake lights so other drivers can see you clearly, and remember that stopping distances can double or even triple in wet conditions. By taking these simple precautions, you’ll be better equipped to handle whatever the weather throws your way.

Tips for Driving in the Rain

• Drive Slowly: allow for slower speeds in wet conditions. Wet roads dramatically reduce tyre grip, so lower your speed to maintain control. Puddle grip levels can be unpredictable, so take extra caution when driving through or around puddles.
• Increase Your Distance: Leave more space between you and the car in front, as well as other cars and other vehicles. A good rule of thumb is to at least double your usual gap. This gives you more time to react and brake safely. 
• Use Dipped Headlights: Even in light rain or overcast conditions, using your dipped headlights makes you much more visible to other road users. However, avoid using your rear fog lights unless visibility is severely restricted, as they can obscure your brake lights and dazzle drivers behind you.
• Watch Out for Spray: Be aware of the spray thrown up by larger vehicles. This can momentarily blind you, so anticipate it and be ready to use your wipers and screen wash.
• Avoid Puddles: Where possible, avoid puddles to prevent water damage to your vehicle and reduce the risk of losing control.
• Avoid Cruise Control: Do not use cruise control in wet or slippery conditions to maintain full control of your vehicle.

How to Drive in Heavy Rain

The biggest danger in heavy rain is aquaplaning.This happens when a layer of water builds up between your tyres and the road surface, causing them to lose contact. The result is the unnerving loss of steering and braking control.

If your steering suddenly feels light and unresponsive, you are likely aquaplaning. Do not panic or brake heavily. Once you have regained grip, gently brush the brake pedal to help restore control. Use the brake pedal gently to avoid skidding. Instead:

1. Gently ease your foot off the accelerator.
2. Hold the steering wheel straight and steady.
3. Allow the car’s speed to reduce naturally until you feel the tyres regain their grip on the road.

To keep your view clear, use your car’s air conditioning. It acts as a dehumidifier and is the fastest way to stop your windows from misting up. 

Stopping Distance in Wet Conditions

It’s a simple fact: your car takes longer to stop in the rain. The water on the road acts as a lubricant, reducing the friction your tyres need to grip the surface and slow down.

The Highway Code states that stopping distances are at least doubled in wet conditions. That’s why increasing your following distance is critical.

A great technique to use is the four second rule. In normal, dry conditions, you’d use a two second rule. To do this, watch the vehicle in front pass a fixed point (like a signpost or a tree) and count for four seconds. If you reach the point before you finish counting, you’re too close. 

How to Drive Through a Flood

Driving through standing water can cause catastrophic engine damage and even sweep your car away. The best advice is simple: if you’re in doubt, don’t risk it. Find an alternative route.

If you absolutely must drive through a flooded section of road, follow these steps with extreme caution:

1. Assess the Depth: Stop before you enter the water. If you can’t see the kerb or the water looks deeper than the bottom of your car’s doors, it’s too deep.
2. Go Slow and Steady: Engage a low gear (first or second) and drive through slowly and consistently. Keep the engine revs high to prevent water from entering your exhaust pipe. Aim to create a small bow wave in front of your vehicle.
3. One at a Time: Wait for any oncoming vehicles to clear the water before you enter.
4. Don’t Stop: Once you’ve started, keep moving until you are completely clear of the water. Stopping in the middle could cause the engine to stall and flood.
5. Test Your Brakes: Once you are out of the water, gently apply your brakes to help dry them off and ensure they are working correctly.

Never attempt to drive through fast flowing water. It only takes a small amount of moving water to lift a car and carry it away.

Your Rain Ready Car Checklist 

Prevention is always better than a cure. Before the rainy season sets in, give your car a thorough check up to ensure it’s ready to handle whatever the weather throws at it.

• Check Your Tyres: Good tyre tread is essential for gripping wet roads and clearing water to prevent aquaplaning. The legal minimum tread depth is 1.6mm, but for optimal safety in the rain, it’s recommended you have at least 3mm. Also, check that your tyre pressures are correct.
• Inspect Your Wiper Blades: Look for any splits, cracks, or signs of perishing rubber. If your wipers are leaving streaks or smearing your windscreen, replace them immediately.
• Top Up Your Screen Wash: Rain often brings with it a lot of dirt and grime from the road. A full reservoir of quality screen wash will help you keep your windscreen clear.
• Test All Your Lights: Make sure your headlights, brake lights, and indicators are all clean and working perfectly. Visibility is key in poor weather.
• Confirm Your Air-Con Works: Check that your air conditioning and demister fans are functioning correctly. They are your best defence against a fogged up interior.

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