The method involves measuring rear spacing (4) between front vehicle (1) and subsequent vehicle (2). The measured distance is compared with predetermined safety distance, and stored in data memory (9) of front vehicle. An optical signal (7) is displayed in...

The vehicle (1) has a brake plate (3) arranged at a lower side (2), and an adjusting device (7) for moving the plate from a resting position (4) to a braking position (5) on a road surface (6). The device connects the plate with the vehicle by using a carr...