Title: RUN-OFF-THE-ROAD ACCIDENTS AND THE ROADSIDE AREA. STAGE 3. ACCIDENT COSTS AND ESTIMATIONS OF ACCIDENT RISKS AND COSTS FOR OBJECTS IN THE ROADSIDE AREA
Abstract: The purpose of this report stage was to: (1) estimate the costs for run-off-the-road accidents, (2) investigate how the costs for run-off-the-road accidents vary with type of object struck, roadside design etc and (3) modify an existing model, with which the reduction in accident costs can be estimated for improvements concerning objects in the roadside area. The results show that 42% of all accidents during 1972-76 on roads maintained by the National Road Administration were run-off-the-road accidents. The proportion of run-off-the-road accidents is greater on road stretches than at intersections - 48% and 28% respectively. The average cost for a run-off-the-road accident is 122000 sw CR if no vehicles collide and 209000 sw CR if the encroachment takes place in combination with a vehicle collision. The lateral distance, i.e. the distance from the road edge to the position of the encroached vehicle, is important when estimating the probability of a collision with a roadside obstacle. The results show that most vehicles are hindered by the ditch and that the distribution of lateral distances can be approximated by the negative exponential distribution. Finally, results are discussed, which show the variations in accident costs, depending upon where in the roadside area the struck object was positioned. The influence of lateral and longitudinal distance is, inter alia, discussed. The type of object struck is more important than its position in the roadside area. (TRRL)
Publication Year: 1979
Publication Date: 1979-01-01
Language: en
Type: article
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