Wondering if driving with under inflated tyres is illegal? This guide explains tyre pressure laws, the dangers of incorrect inflation, and how to check your tyres properly. Learn what fines you could face, how laws differ around the world, and the best ways to keep your tyres safe and road-legal.
As your car tyres are the only component that makes contact with the road surface, it’s important that they are well maintained.
Not only is good tyre maintenance integral for safety and driver comfort, but it also plays a part in the legality of your tyres – both during an MOT test and if you get stopped on the road by highways officers.
Most drivers know that in order for tyres to be legal and safe to drive on, they need to have a minimum tread depth of at least 1.6mm. But how does tyre pressure impact the safety and legality of a tyre?
Tyre Pressure Laws in the UK
In the UK, it is illegal to drive on tyres which are excessively under inflated and over inflated.
This is because of the safety implications.
Under inflated tyres are too soft, with too much of the rubber surface spreading across the road surface. This affects handling and makes the tyres sluggish, especially when navigating corners and turns.
Over inflation is another major issue, as it puts extra pressure on the rubber and increases the risk of blowout and a sudden loss of control.
What if I am Caught With Under Inflated Tyres?
If a driver is caught with under inflated tyres, they can be fined up to £2,500 per tyre – as well as given points on their licence.
Should all four tyres be under inflated, this could amount to a huge £10,000 and a driving ban.
Is the Law the Same All Over the World?
So, that’s UK driving laws and the importance of vehicle maintenance here. But what about overseas?
The minimum tread depth for tyres is 1.6mm all over the world. And while there are instances where a slightly lower tyre pressure can help, for example during the colder months when the roads are wet and more slippery, most vehicle maintenance laws are global.
