174 MINISTRY OF SUPPLY RUBBER SHORTAGE GO EASY WITH 90% of the world's natural rubber resources are in enemy hands—care in the use of tyres is the most effective way to conserve available supplies. Never drive a commercial vehicle above its legal speed limit. Avoid driving a car over 40 m.p.h. Never corner at speed. Never accelerate fiercely. Remember that fierce brak- ing wastes rubber. YOUR TYRES! REMEMBER, it is equally important —to have tyre pressures checked every week. Submit tyres for replacement before the fabric is visible.