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.
The legal minimum tread depth for cars in the UK is 1.6mm throughout a continuous band comprising the central three-quarters of the breadth of the tread and around its entire outer circumference.
In wet weather, tyre tread grooves help to move water from the contact patch between your tyres and the road surface meaning your car can break, 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.