A method for controlling the speed of a motor vehicle and the distance of a
motor vehicle to at least one motor vehicle driving ahead includes the
steps of: inputting a setpoint trailing distance to the motor vehicle
driving ahead; determining, in accordance with at least one detector, at
least the speed of the motor vehicle, the distance, and the speed relative
to the motor vehicle driving ahead; decelerating or accelerating the motor
vehicle in response to the detected distance deviating from the setpoint
trailing distance; calculating, in response to the motor vehicle driving
ahead being lost from the detection range of the detector (target loss),
the speed of the motor vehicle driving ahead from the relative speed
determined prior to losing the target; and calculating the actual distance
from the driving speed of the motor vehicle. Thus, the speed of the motor
vehicle driving ahead is derived from the measured values measured prior
to the time of losing the target, and, in accordance with a differential
time unit, the distance is extrapolated from the driven speed of the motor
vehicle and the speed of the motor vehicle driving ahead.