Parallel Petri-Net Simulations for Traffic Control in Conurbations

PATRIC - CP94-675

Keywords: traffic control, Petri nets, environment, decision support, simulation, parallel processing, air quality, GIS

Start Date: 1 February 95 / Status: finished / Duration: 24 months

[ participants / contact]

Objectivies and Approach

The aim of the project is to develop a model-based software system for traffic control in conurbations. It will consist of a traffic model based on knowledge attributed Petri-nets, an air pollution model coupled with the Petri-net model, and a tool for decision support for users in traffic administrations in the form of a hierarchical architecture. The time consuming simulation models for traffic and air pollution will be implemented on a parallel computer.

Progress and Results

Based on the conceptual design, on model elements and a model prototype, a traffic flow model has been developed and implemented. The analysis of the exhaust gase emission of vehicles depending on the vehicle parameters and the traffic conditions has been undertaken. The decision support system for traffic control has been developed and implemented. It consists of two main parts: an expert system for deriving operational and strategic decisions to reduce time delays and air pollution, and a geographical information system (GIS) including a relational database to manage and to visualise all input and output data. By means of the expert system, functional relationships between the traffic volume at certain points of the road network and the pollutants concentrations have been studied in order to determine the optimal traffic lights intervals.

After implementing and testing the stand-alone software system on a workstation, a client-server version has been implemented in order that users can access the expert system on the server from a PC-type terminal with the GIS.

Information Dissemination Activities and/or Exploitation

The pilot application will be traffic control in Budapest, though the system will be developed in such a manner that application to other conurbations is possible with little effort. Simulation results will be used to improve the control of traffic lights, to plan the construction of new roads, and to improve public transport systems.

Work done by the partners was presented at the European Simulation Meeting on Simulation Tools and Applications that took place in Hungary in 1995.


Rudower Chaussee 5
D-12489 Berlin, D

EU Partners


Non-EU Partners



Prof. Achim Sydow
Tel: +49 30 63 92 18 13
Fax: +49 30 63 92 18 05

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PATRIC - CP94-675, May 1997

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html version of synopsis by Nick Cook