Aachener Straßenbau- und Verkehrstage 2009
Symposium at the SuperC

Every November since 2000 the research association Straßenwesen, Erd- und Tunnelbau e.V. (SETAC) in cooperation with the association Vereinigung der Straßenbau- und Verkehrsingenieure e.V. (VSVI) have been organising the Aachener Straßenbau- und Verkehrstage (ASVT).

As in previous years, prominent figures from various sectors of road construction and traffic telematics gave lectures on current developments, tendencies and methods. Apart from that, the symposium provides the members of the associations with the opportunity to present their most recent developments within the frame of the connected exhibition. For the first time, the event took place at the new futuristic glass building of the RWTH Aachen, the so called SuperC.

Heusch/Boesefeldt - as a member of the SETAC - once again presented itself at the exhibition and contributed to the programme with a presentation. On the second day of the symposium our colleague Dipl.-Ing. Christoph Schwietering gave a lecture on his research project with the title SBA – Steuerungsalgorithmus zum präventiven Eingreifen in den Verkehrsablauf (Control algorithms for a preventive intervention in traffic flow).

Topic of the research project is a specifically developed model which can be applied especially in traffic control. The essential parameter is the alterable capacity describing the traffic flow on motorways, which here is regarded as stochastically distributed and not considered as a constant, deterministic value. To support the approach an extensive statistic data analysis based on the information from 100 detection sites on Austrian motorways was carried out.

The achieved results on the probability of a breakdown in the traffic flow can be applied in traffic control. A control algorithm (AIX-ProB - Anticipation of Incidents with extended Probability of Breakdown) was developed, which uses the probability of breakdown by taking into consideration factors of influence which vary over time (day light, rush hour, wetness, etc.). The method requires neither elaborate parameterisation nor configuration and is applicable for any road section. In comparison to other control algorithms with preventive character it is able to reliably anticipate traffic states and to initiate respective measures. Especially the consideration of the influence of environmental conditions onto the probability of breakdown has a positive impact on the quality of the algorithm. All in all it could be demonstrated that AIX-ProB can suitably be applied in adaptive traffic management.