177 MINISTRY OF SUPPLY RUBBER SHORTAGE DON'T DRIVE ON YOUR BRAKES! EVERY TIME YOU STOP WITH A JERK, YOU TEAR RUBBER OFF YOUR TYRES 90% of the world's natural rubber resources are now in enemy hands. This places a heavy responsibility on every owner and driver of motor vehicles. For the most effective way to conserve Britain's rubber stocks is to take the utmost care of the millions of tyres still in daily use. 18 Points for Drivers Have tyre pressures checked every kerb • See that week • Submit tyres for replacement adjusted • when they are smooth • Never drive from treads a commercial vehicle above its legal that tyres speed limit • Avoid driving a car over ly and regularly • See that tyres and 40 m.