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首页> 外文期刊>Transport Engineering in Australia >Roundabouts: Why they are dangerous for cyclists and what can be done about it
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Roundabouts: Why they are dangerous for cyclists and what can be done about it

机译：回旋处：为什么它们对骑自行车者很危险，对此可以采取什么措施

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摘要

Roundabouts experience fewer and less severe vehicle crashes than typical intersections. Yet this safety benefit does not extend to bicycles. The reasons for this are analysed through a literature review and a case study of roundabout crashes occurring in Victoria from 2005-2009. The most common type of roundabout crash is "entering-circulating" vehicle conflicts (82% for roundabout crashes involving bicycles). Speed and visibility of circulating vehicles are the major contributing factors particularly as bicycles are often located where drivers do not look. Austroads promotes the use of circulating bicycle lanes. However, this analysis explains why such designs may increase risks to cyclists. Many researchers have found that riding on the outside edge of circulating carriageways is dangerous for cyclists. Little has been written about why. Many cyclists ride close to the kerb, with cars beside them "sharing" the lane, effectively allowing two traffic streams within one lane. At a 1-lane roundabout, this creates an environment with 24 conflict points, but approaching drivers expect just 4. Drivers check the inner path for a gap, ignoring the unexpected outer path and sometimes striking a cyclist they never saw. Cyclists are safest if they merge with cars before a roundabout then ride in the middle of the driving lane. This maximises their visibility to cars, maintains a simple one-lane conflict point environment, and reduces the likely speed of impact if a collision does occur. Treatments are proposed which slow approaching, entering and circulating vehicles and facilitate central lane positioning by cyclists for maximum visibility.
机译：与典型的十字路口相比，回旋处的车辆撞车事故越来越少。然而，这种安全益处并未扩展到自行车。通过文献综述和2005-2009年维多利亚州发生的环岛交通事故案例分析，分析了其原因。回旋交通事故最常见的类型是“进入循环”车辆冲突（涉及自行车的回旋交通事故占82％）。循环车辆的速度和能见度是主要的影响因素，特别是因为自行车经常位于驾驶员看不到的地方。 Austroads鼓励使用循环自行车道。但是，该分析解释了为什么这种设计可能会增加骑车人的风险。许多研究人员发现，在循环行车道的外侧骑行对骑自行车的人来说是危险的。关于原因的报道很少。许多骑自行车的人靠近路边，旁边有汽车“共享”车道，有效地允许一条车道内有两路交通流。在1车道的回旋处，这会创建一个具有24个冲突点的环境，但接近的驾驶员期望的距离仅为4。驾驶员检查内部路径是否有空隙，而忽略了意外的外部路径，有时还会撞到从未见过的骑自行车的人。如果骑车者在回旋处之前与汽车合并，然后在行车道的中间骑行，则最安全。这样可以最大程度地提高对汽车的视野，保持简单的单车道冲突点环境，并在发生碰撞时降低撞击的可能速度。提出了使车辆慢速驶入，进入和循环并有助于骑车人在中央车道定位的处理方法，以实现最大的视野。

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