A driver assistance system includes a distance measuring device which detects distance values of objects from the surroundings of a vehicle. Based on a coordinate system that is fixed to the vehicle, the surroundings of the vehicle are subdivided into zones. Individual quality measures are assigned to distance values from the particular zones or measured quantities derived from these distance values. The individual quality measure is a function in particular of the variation of the component of the relative velocity in the longitudinal direction of the vehicle.