Improved Time-to-Collision Definition for Simulating Traffic Conflicts on Truck-Only Infrastructure
Improved Time-to-Collision Definition for Simulating Traffic Conflicts on Truck-Only Infrastructure
复制标题
改进了碰撞时间定义，用于模拟纯卡车基础设施上的交通冲突
DOI：
10.3141/2237-04
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发表时间：
2011
影响因子：
1.7
通讯作者：
B. Abdulhai
中科院分区：
文献类型：
--
作者：
C. Bachmann;M. Roorda;B. Abdulhai
交通运输机构传统上依赖历史碰撞记录作为评估道路安全性的主要措施。事故的不频繁和零星发生以及收集事故数据所需的长时间导致使用替代安全措施。使用微仿真建模进行冲突分析已经推广到评估现有道路网络的实验变化。以前的高速公路研究使用了一个简化的碰撞时间定义，这产生了不现实的冲突情况。该定义包括没有碰撞路径的情况，例如两辆车以相同的速度行驶，或者领先的车辆加速远离后面的车辆。修订后的冲突定义是为了解决这些问题，然后与早期研究中使用的简化定义进行对比。对加速率的调查表明，修订后的方法保留了以前定义产生的有意义的冲突，但消除了不太可能发生冲突的情况。这个修订后的冲突定义被用于对加拿大安大略省大多伦多地区的一条仅限卡车的高速公路进行评估，以观察其对交通冲突的影响。总的来说，虽然为卡车提供单独的高速公路确实减少了与卡车相关的冲突，但由于汽车的机动性和在无卡车高速公路上的存在，汽车变道冲突增加了。
Transportation agencies have traditionally relied on historical crash records as the primary measure to evaluate the safety of roadways. The infrequent and sporadic occurrence of accidents and the long period required to collect accident data have led to the use of surrogate safety measures. The use of microsimulation modeling for conflict analysis has been popularized for evaluating experimental changes to existing road networks. Previous freeway studies have used a simplified time-to-collision definition, which produces unrealistic conflict situations. The definition included situations with no collision path, such as when two vehicles were traveling at the same speed or when the leading vehicle was speeding away from the following vehicle. A revised conflict definition is developed to address these issues and is then contrasted with the simplified definition used in earlier studies. An investigation of acceleration rates demonstrates that the revised approach retains the meaningful conflicts produced by the previous definition but eliminates the situations that are unlikely to be conflicts. This revised conflict definition is used to investigate the evaluation of a truck-only highway in the greater Toronto, Ontario, Canada, area to observe the effects on traffic conflicts. In general, it was found that although providing a separate highway for trucks did reduce truck-related conflicts, car lane-change conflicts increased because of the cars' increased maneuverability and presence on the truck-free highway.