Ahead of this September's IAA Commercial Vehicles trade fair in Hanover, Mercedes has presented the newest technological developments in heavy trucks in a live demonstration The emergency Active Brake Assist 4, with pedestrian recognition and turn-off assistant, sets new standards in pedestrian protection.At the presentation, a real person - not a test-crash dummy - stepped onto the street in front of the moving Actros to demonstrate the reliability of the system. But the new assistant -- and other technical developments -- can't replace responsible, respectful behavior on the road.