Dresden 2003 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

AKSOE: Physik sozio-ökonomischer Systeme

AKSOE 8: Urbane Systeme und Verkehrsdynamik

AKSOE 8.3: Talk

Wednesday, March 26, 2003, 17:00–17:30, BAR/205

Explaining and Simulating Experimental Time-Gap Distributions and Flow Patterns of freeway traffic — •Martin Treiber and Dirk Helbing — Institut für Wirtschaft und Verkehr, TU Dresden

Based on the statistical evaluation of experimental single-vehicle data, we propose a quantitative explanation of the erratic scattering of flow-density data in synchronized traffic flows. A correlation analysis suggests that the observed scattering is well compatible with unique equilibrium velocity-distance relations for each driver and stems from the observed large variation of the individual netto time gaps in combination with positive correlations of the gaps between successive vehicles. Two-lane multi-class microsimulations with the Intelligent-Driver Model show that this correlation is caused by dynamical clustering effects

We also observe No-dqfrustration effectsNo-dq:

• The most probable netto time gap in congested traffic flow upstream of a bottleneck is significantly increased compared to uncongested freeway sections.
• A further increase, connected with a decreased outflow at the downstream boundary of the jam occurs for very extended congestions. We simulated all this by incorporating frustration effects in our model.