Berlin 2008 – scientific programme

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AKSOE: Arbeitskreis Physik sozio-ökonomischer Systeme

AKSOE 17: Traffic Dynamics, Urban, and Regional Systems

AKSOE 17.1: Talk

Thursday, February 28, 2008, 16:15–16:45, EW 203

Complex structure of steady state traffic flow diagram: Theory and data — •Christof Liebe — Universität Rostock, Institut für Physik, 18051 Rostock, Deutschland

Within the american Next Generation Simulation Program (NGSIM) several vehicular datasets were recorded during the last years. These datasets contain a huge amount of data which leads to a good basis of traffic data analysis.

From the view of a physicist it is always positiv to map the reality to simple models. The optimal velocity model is such a simple one. Basically it is a relaxation to an optimal velocity, which is a sigmoidal function depending on the distance to the car in front.

Nevertheless this simple model leads to interesting phenomena well known from real traffic data like jams (cluster formation). Numerical analysis of a one-lane circular road shows a complex fundamental diagram with hysteresis effect. To compare this diagram with the datasets one has to take the length of a car into account which leads to limitation of the density.

Also comparisons concerning the energy and power of cars will be presented.