a Transportation Research Institute (IMOB) , Hasselt University , Diepenbeek , Belgium.
Traffic Inj Prev. 2015;16(2):202-7. doi: 10.1080/15389588.2014.927576.
Roundabouts are a type of circular intersection control generally associated with a favorable 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.
An analysis of 399 crashes on 28 roundabouts in Flanders, Belgium, was carried out based on detailed crash descriptions; that is, 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.
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 characterized by significantly higher proportions of injury crashes. About 80% of the crashes occurred on the entry lanes and the circulatory road (segments 1-4). Road users who are the most at risk to be involved in serious injury crashes at roundabouts are cyclists and moped riders.
The main goal of this study was to identify and analyze 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.
环岛是一种圆形交叉路口控制方式，通常与交通安全的有利影响有关。国际上对环岛交叉口的研究表明，环岛交叉口的事故发生率显著降低，尤其是涉及致命或重伤的事故。然而，仍有一些事故发生在环岛。本研究旨在通过识别与环岛事故相关的事故类型、地点和因素，提高对环岛安全的认识。
根据详细的事故描述，对 28 个位于比利时佛兰德的 399 起环岛事故进行了分析，即事故数据和碰撞图。这些事故是从比利时佛兰德地区警方报告的环岛事故中抽样得出的。使用登记事故的碰撞图来区分 8 种不同的事故类型。根据先前关于环岛事故发生的知识，将环岛本身分为 11 个详细而不同的典型段。分析了 8 种环岛事故类型，涉及伤害严重程度、环岛内的事故位置、环岛类型、自行车道类型以及涉及的道路使用者类型。
确定了四种主要的碰撞类型：追尾事故、与弱势道路使用者的碰撞、进入环岛的碰撞和与中央岛的单车碰撞。与弱势道路使用者的碰撞和与中央岛的碰撞，其重伤事故的比例明显更高。约 80%的事故发生在入口车道和循环道（第 1-4 段）。在环岛最容易发生严重伤害事故的道路使用者是骑自行车的人和骑轻便摩托车的人。
本研究的主要目的是通过考虑事故地点的详细信息，识别和分析环岛的主要事故类型。发现了某些环岛事故类型、其事故地点和环岛设计特征之间的一些联系。
