Having less tread than required on your car is not just illegal, its unsafe!
How Much Tread? The minimum amount of tread, which provides a secure grip, is around 3.5mm - about the depth of a match-head Less than 1.6mm is an offence by law In wet conditions, 3.0mm or less means that your traction and stopping power is greatly reduced When driving in snow, traction can be compromised at 4.75mm tread depth.