Jensen Søren Underlien
Trafitec, Diplomvej 376, 2800 Kgs. Lyngby, Denmark.
Accid Anal Prev. 2008 Mar;40(2):742-50. doi: 10.1016/j.aap.2007.09.016. Epub 2007 Oct 4.
This paper presents a before-after accident study of marking blue cycle crossings in 65 signalised junctions. Corrections factors for changes in traffic volumes and accident/injury trends are included using a general comparison group in this non-experimental observational study. Analysis of long-term accident trends point towards no overall abnormal accident counts in the before period. The safety effect depends on the number of blue cycle crossings at the junction. One blue cycle crossing reduces the number of junction accidents by 10%, whereas marking of two and four blue cycle crossings increases the number of accidents by 23% and 60%, respectively. Larger reduction and increases are found for injuries. Safety gains at junctions with one blue cycle crossing arise because the number of accidents with cyclists and moped riders that may have used the blue cycle crossing in the after period and pedestrians in the pedestrian crossing parallel and just next to the blue marking was statistically significant reduced. Two or four blue cycle crossings especially increase the number of rear-end collisions only with motor vehicles involved and right-angle collisions with passenger cars driving on red traffic lights.
本文介绍了一项针对65个信号控制路口设置蓝色自行车道交叉口的事故前后研究。在这项非实验性观察研究中，使用一般对照组纳入了交通流量变化以及事故/伤害趋势的校正因子。对长期事故趋势的分析表明，前期总体事故数量并无异常。安全效果取决于路口蓝色自行车道交叉口的数量。一个蓝色自行车道交叉口可使路口事故数量减少10%，而设置两个和四个蓝色自行车道交叉口则分别使事故数量增加23%和60%。伤害方面的增减幅度更大。设置一个蓝色自行车道交叉口的路口安全效益得以显现，是因为后期可能使用蓝色自行车道交叉口的骑自行车者和轻便摩托车驾驶者以及与蓝色标记平行且紧邻的人行横道上行人发生事故的数量在统计上显著减少。两个或四个蓝色自行车道交叉口尤其只会增加仅涉及机动车的追尾碰撞以及与闯红灯行驶的乘用车的直角碰撞数量。
