Calculation of an applicable friction coefficient of the reconstruction of traffic accidents with the aid of measured roughness on the spot and the GIDAS-database

The GIDAS investigation team of Dresden (VUFO) has documented more than 11,500 accidents since 1999. Beside vehicle-, injury- and environmental data the documentation of the accidents includes very detailed reconstruction data. Within this accident investigation the VUFO began to record the skid resistance of the accident site in 2009. The measurements are divided in macro- and microroughness (Sand depth method and Portable Skid Resistance Tester (SRT) by Munro-Stanley London(R)). Both methods are used to determine the skid resistance for more than 1,000 passenger cars. The aim of the present study is to find out a relationship between the measured skid resistance, the road conditions and the friction coefficient, which is used to calculate the maximum accelerations and decelerations during a reconstruction of an accident. Basic approach to convert the SRT-value into the friction coefficient is the calculation of the theoretical absorbed energy of the spring rubber system of the swinging arm of lever. This absorbed energy is used to get the friction coefficient by using the equations for the work of friction. To consider the road behavior, in correlation to the friction coefficient, the results will be merged with existing literature. Last step for this study will be a comparison between actual used friction coefficients all over the GIDAS database and the theoretical results. The study shows whether it is possible to use the SRT measurement for the estimation of a friction coefficient for the reconstruction of a traffic accident. As expected, the GIDAS database and the additional measurement of the roughness of the road directly on the spot are an enormous useful dataset. (A) Paper to the session "Methodology of In-Depth Investigations, Part I" of the 5th International Conference on ESAR "Expert Symposium on Accident Research", 7th to 8th September 2012 in Hannover.


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  • Accession Number: 01497309
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • ISBN: 978-3-95606-021-2
  • Files: ITRD
  • Created Date: Oct 9 2013 8:37AM