Tyre treads are designed to give good grip on wet roads but this generally decreases as a tyre’s tread pattern wears down or as the depth of water increases. Drivers should take this into consideration and reduce their speed accordingly in wet conditions
LEGAL MINIMUM TREAD DEPTH
The legal minimum tread depth for cars in the UK is 1.6mm throughout a continuous band comprising the central three-quarters of breadth of the tread and around its entire outer circumference. In wet weather tyre tread grooves help to remove water from the contact patch between your tyres and the road surface meaning your car can brake, steer and accelerate properly.
Without adequate tread depth your tyres may not be able to perform properly in wet conditions, reducing your safety on the road. It is therefore advisable to consider replacing your tyres well before they reach the legal minimum. Furthermore, drivers whose tyres fail to comply with the minimum tread depth requirements risk a fine of up to £2,500 and three penalty points for each illegal tyre
In situations when your tyres have insufficient tread depth to clear the water properly from the road surface, you may experience the particularly hazardous phenomenon of aquaplaning. During aquaplaning, your tyres lose contact with the road surface and travel on top of the water’s surface. With no contact with the road, you are unable to accelerate, brake or steer effectively, greatly increasing your risk of being involved in an accident. To reduce your risk of aquaplaning, check your tyre tread depth regularly. Take a look at how aquaplaning can affect your safety.