A new and novel development in ensuring motorists always have the right pressure in their tyres is the self-inflating tyre system.
The SIT system is simple but very clever, and involves fitting a tube chamber to the tyre wall. When the vehicle is moving, the tube acts as what is known as a peristaltic (waves of contraction) pump and pushes air into the tyre. When the tyre reaches its desired pressure, a valve prevents any more air being pumped in.
This means that the tyre pressure - which we should all check regularly, though most of us don't - no longer has to be checked at all. If air is lost, the SIT system provides a top up, so the tyre is always at its correct pressure, which in turn means increased tyre life, better fuel economy and potentially safer motoring.