Abstract
Major differences in basic accident avoidance characteristics are almost inevitable when one compares typical private cars with various other cases of motor- driven road vehicles - and they are becoming more marked. An entirely new situation must be created in which the car driver can stop his vehicle in a controlled and safe manner, no matter what the weather, road or traffic conditions are, or how rashly or inexpertly the driver reacts to them, whereas very few truck drivers will have the benefit of such technological quick- reacting devices.