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Affiliation
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a Transportation Research Institute (IMOB) , Hasselt University , Wetenschapspark 5 Bus 6, BE-3590 Diepenbeek , Belgium , Fax: +32(0)11 26 91 99 , Tel.: +32(0)11 26 91-{ 44; 56;/; 55} , E-mail: evelien.polders@uhasselt.be stijn.daniels@uhasselt.be ; tom.brijs@uhasselt.be. |
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Abstract
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OBJECTIVES: Roundabouts are a type of circular intersection control generally associated with a favourable influence on traffic safety. International studies of intersections converted to roundabouts indicate a strong reduction in injury crashes, particularly for crashes with fatal or serious injuries. Nevertheless, some crashes still occur at roundabouts. The present study aims to improve the understanding of roundabout safety by identifying crash types, locations and factors that are associated with roundabout crashes.
METHODS: An analysis of 399 crashes on 28 roundabouts in Flanders-Belgium was carried out based on detailed crash descriptions, i.e. crash data and collision diagrams. The crashes are sampled from police-reported crashes at roundabouts in the region of Flanders, Belgium. Collision diagrams of the registered crashes were used to distinguish 8 different crash types. The roundabout itself is divided into 11 detailed and different typical segments, according to previously established knowledge on the occurrence of crashes at roundabouts. The 8 roundabout crash types are examined by injury severity, crash location within the roundabout, type of roundabout, type of cycle facility and type of involved road user.
RESULTS: Four dominant crash types are identified: rear-end crashes, collisions with vulnerable road users, entering-circulating crashes and single-vehicle collisions with the central island. Crashes with vulnerable road users and collisions with the central island are characterised by significantly higher proportions of injury crashes. About 80% of the crashes occurred on the entry lanes and the circulatory road (segment 1-4). Road users that are the most at risk to be involved in serious injury crashes at roundabouts are cyclists and mopeds.
CONCLUSIONS: The main goal of this study was to identify and analyse dominant crash types at roundabouts by taking into account detailed information on the crash location. Some connections between certain roundabout crash types, their crash location and roundabout design characteristics have been found.
Language: en |