Traffic barriers are in widespread all around the USA as safety countermeasures for reducing the severity of run-off-road crashes. The effect of traffic barriers’ dimension had been ignored in past real-world crash studies due to the considerable cost and time needed for collecting field data. This paper presented two new analytical models to investigate the effect of different variables on the severity of crashes involving traffic barriers, and end treatments. For this reason, a field survey was conducted on over 1.3 million linear feet of traffic barriers (approximately 4,176 miles road) in Wyoming to measure traffic barriers’ geometric features like height, length, offset, and slope rate. The collected data included 55% of all non-interstate roads of Wyoming. Based on results, the crashes involving box beam barriers were less severe than the crashes involved with W-beam or concrete barriers. The traffic barriers with a height between 28 and 31 in. were found safer than the traffic barriers shorter than 28 in., while there was no significant difference between the traffic barriers taller than 31 in. to those shorter than 28 in. in terms of crash severity. The end treatments located nearer to the traffic lane had lower crash severity.

中文翻译：

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通过考虑交通障碍尺寸的影响对交通障碍碰撞严重性进行建模

作为降低对撞车事故严重程度的安全对策，交通障碍在美国各地普遍存在。由于收集现场数据需要大量成本和时间，因此在过去的现实世界碰撞研究中，交通障碍的尺寸影响一直被忽略。本文提出了两个新的分析模型，以研究不同变量对涉及交通障碍和最终处理的碰撞严重性的影响。因此，对怀俄明州超过130万线性英尺的交通障碍（约4176英里）进行了实地调查，以测量交通障碍的几何特征，例如高度，长度，偏移和坡度。收集的数据包括怀俄明州所有非州际公路的55％。根据结果​​，箱形梁式障碍物的碰撞不如W型梁或混凝土障碍物严重。高度在28到31英寸之间的交通障碍物比短于28英寸的交通障碍物更安全，而高出31英寸的交通障碍物与短于28英寸的交通障碍之间没有显着差异。崩溃严重程度。靠近行车道的最终处理措施降低了碰撞严重性。