Single-vehicle data of highway traffic: microscopic description of   traffic phases
  We present a detailed analysis of single-vehicle data which sheds some light on the microscopic interaction of the vehicles. Besides the analysis of free flow and synchronized traffic the data sets especially provide information about wide jams which persist for a long time. The data have been collected at a location far away from ramps and in the absence of speed limits which allows a comparison with idealized traffic simulations. We also resolve some open questions concerning the time-headway distribution. 
Wolfgang Knospe, Ludger Santen, Andreas Schadschneider, Michael   Schreckenberg