Car following model improvement for traffic safety metrics reproduction
Bevrani, Kaveh & Chung, Edward (2011) Car following model improvement for traffic safety metrics reproduction. In Proceedings of the Australasian Transport Research Forum 2011, PATREC, Adelaide Hilton Hotel, Adelaid, SA, pp. 1-14. (In Press)
Car Following models have a critical role in all microscopic traffic simulation models. Current microscopic simulation models are unable to mimic the unsafe behaviour of drivers as most are based on presumptions about the safe behaviour of drivers. Gipps model is a widely used car following model embedded in different micro-simulation models. This paper examines the Gipps car following model to investigate ways of improving the model for safety studies application. The paper puts forward some suggestions to modify the Gipps model to improve its capabilities to simulate unsafe vehicle movements (vehicles with safety indicators below critical thresholds). The result of the paper is one step forward to facilitate assessing and predicting safety at motorways using microscopic simulation. NGSIM as a rich source of vehicle trajectory data for a motorway is used to extract its relatively risky events. Short following headways and Time To Collision are used to assess critical safety event within traffic flow. The result shows that the modified proposed car following to a certain extent predicts the unsafe trajectories with smaller error values than the generic Gipps model.
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|Item Type:||Conference Paper|
|Keywords:||Microscopic Simulation Models, Safety Indicators, Gipps Car Following Model|
|Subjects:||Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Transport Engineering (090507)|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering|
Past > Schools > School of Urban Development
Current > Research Centres > Smart Transport Research Centre
|Copyright Owner:||Copyright 2011 [please consult the authors] University of South Australia and the South Australian Department for Transport, Energy and Infrastructure.|
|Deposited On:||12 Aug 2011 08:36|
|Last Modified:||06 Oct 2011 19:21|
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