1. A driver assistance system for a vehicle, comprising: a position finding system for detecting objects in the surroundings of the vehicle, wherein the position finding system acquires position finding data; at least one driver-assistance-function unit; and a device for determining a potentially dangerous situation by recognizing a characteristic feature in at least one distribution curve of position finding data for a set of detected objects; wherein: the potentially dangerous situation is an end of one of a traffic jam and a road block; the distribution curve includes position finding data of at least one of stationary and slow-moving objects not analyzed by the driver-assistance-function unit; and the at least one distribution curve provides velocities of detected objects as a function of measured distances of detected objects, and wherein the characteristic feature is a monotonous decrease in velocities with increasing distances.