Identifying crash type propensity using real-time traffic data on freeways.

INTRODUCTION We examine the effects of various traffic parameters on type of road crash. METHOD Multivariate probit models are specified on 4-years of data from the A4-A86 highway section in the Ile-de-France region, France. RESULTS Empirical findings indicate that crash type can almost exclusively be defined by the prevailing traffic conditions shortly before its occurrence. Rear-end crashes involving two vehicles were found to be more probable for relatively low values of both speed and density, rear-end crashes involving more than two vehicles appear to be more probable under congested conditions, while single-vehicle crashes appear to be largely geometry-dependent. IMPACT ON INDUSTRY Results could be integrated in a real-time traffic management application.

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