车辆碰撞预警系统对行车风险的干预效果

各类碰撞预警系统已广泛应用于具有驾驶辅助功能的车辆上,为研究预警系统对风险状态下车辆交互行为特征的影响机理,并评估其对行车风险的干预效果,采用15辆搭载预警系统的试验车辆在真实高速公路场景下进行实车群组试验,通过有-无预警情形对比试验及分析,从车辆交互行为特征指标、道路总体运行风险、驾驶员对预警系统认可度3个维度,对行...

A Field Study for Evaluating the Effectiveness of Vehicle Collision Warning Systems

Advanced driver assistance systems have been widely installed on various types of vehicles. To study the effectiveness of the collision warning systems, a field test was conducted on real-world expressways. A group of 15 vehicles underwent a comparative test equipped with or without the system. During the testing, a method for evaluating the effectiveness of the early warning system has been proposed from the following three aspects: interactions between vehicles, safety risk, and acceptance of the driver. Study results show that, at the microscopic level, under the scenarios that the vehicles are equipped with the system, when accidents take place during car-following and lane-changing for overtaking action, the average time headway (THW) observed increases by 0.37 s and 0.34 s, respectively. It is also found that using the system has a significant impact on the THW (p < 0.05). In contrast, at the mesoscopic level, the frequency of the above two types of accidents drops by 16.0% and 23.7%, respectively, as a result of early warning provided by the system. The dispersion degree of the vehicle speed in the group is also found to decrease significantly. The questionnaire survey shows that 86.7% of drivers will take safety measures after receiving the warningfrom the system, and 73.3% of drivers agree that the early warning system improves road safety.