Abstract: The invention relates to a method for determining traffic related information within a traffic system with the aid of mobile detectors (1), particularly from vehicles selected at random. According to the invention, the information which is used for determining the traffic situation is at least the standard deviation (&sgr;) of the driven speed (vi) of the mobile detector (1) compared to the average speed (vm) of the mobile detector (1) on a section of a road (A B), and/or the sum (S) of the stationary time on said section of a road (A-B).