Modeling traffic barriers crash severity by considering the effect of traffic barrier dimensions  

作　　者：Amirarsalan Mehrara Molan Mahdi Rezapour Khaled Ksaibati 

机构地区：[1]Wyoming Technology Transfer Center,Department of Civil&Architectural Engineering,University of Wyoming

出　　处：《Journal of Modern Transportation》2019年第2期141-151,共11页现代交通学报（英文版）

基　　金：part of project#RS03218 funded by the Wyoming Department of Transportation(WYDOT)

摘　　要：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.Traf?c barriers are in widespread all around the USA as safety countermeasures for reducing the severity of run-off-road crashes. The effect of traf?c barriers’ dimension had been ignored in past real-world crash studies due to the considerable cost and time needed for collecting ?eld data. This paper presented two new analytical models to investigate the effect of different variables on the severity of crashes involving traf?c barriers, and end treatments.For this reason, a ?eld survey was conducted on over 1.3 million linear feet of traf?c barriers(approximately 4,176 miles road) in Wyoming to measure traf?c 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 traf?c barriers with a height between 28 and 31 in. were found safer than the traf?c barriers shorter than 28 in., while there was no signi?cant difference between the traf?c barriers taller than31 in. to those shorter than 28 in. in terms of crash severity.The end treatments located nearer to the traf?c lane had lower crash severity.

关 键 词：Crash severity Run-off-road crashes Traffic barriers End treatments Traffic barrier dimensions Real-world crash analysis Wyoming 

分 类 号：U[交通运输工程]