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Identifying the Factors Contributing to Freeway Crash Severity Based on Discrete Choice Models

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Listed:
  • Wen Cheng

    (School of Economic and Management, Chang’an University, Xi’an 710064, China
    Rail Transit Department, Zhejiang Institute of Communications, Hangzhou 311112, China)

  • Fei Ye

    (Rail Transit Department, Zhejiang Institute of Communications, Hangzhou 311112, China
    School of Transportation Engineering, Chang’an University, Xi’an 710064, China)

  • Changshuai Wang

    (School of Transportation, Southeast University, Nanjing 210096, China)

  • Jiping Bai

    (Rail Transit Department, Zhejiang Institute of Communications, Hangzhou 311112, China)

Abstract

The freeway’s operation safety has attracted wide attention. In order to mitigate the losses brought on by traffic accidents on freeways, discrete choice models were constructed based on the statistical analysis method to quantitatively analyze the significance and magnitude of the impact of multiple dimensional factors on crash severity. Based on 1154 accidents that occurred on Zhejiang Province’s Hang-Jin-Qu Fressway from 2013 to 2018, the distribution characteristics of crash severity were analyzed. The dependent variable was the crash injury severity, which was categorized into property damage only (PDO), injury, and fatal. As independent variables, 15 candidate variables representing four aspects, including driver, vehicle, road, and environmental conditions, were chosen. Considering the ordered characteristics of the variables, the models developed included the ordered logit, the generalized ordered logit, and the partial proportional odds models. The Brant test found that the previous two models had difficulty dealing with the problem of partial variables that did not fit the parallel-lines assumption, and the conclusions were finally discussed through the partial proportional odds model results. The findings indicate that 11 factors have significant consequences. Five variables, namely “mountainous”, “female”, “driving experience 2- years”, “large vehicle responsible”, and “vehicle not going straight”, violated the parallel-lines assumption. Female drivers and drivers aged 55+ years were more likely to suffer injuries and fatalities in collisions with guardrails and other objects. Large vehicles being involved and vehicles not going straight enhanced the likelihood of injury and fatal outcomes when drivers had 2- years of experience. Wet-skid road conditions enhanced the likelihood of injury accidents, and driving at nighttime without lighting increased the likelihood of fatal accidents. Departments responsible for traffic management can take full account of these variations and develop focused proposals for improvement.

Suggested Citation

  • Wen Cheng & Fei Ye & Changshuai Wang & Jiping Bai, 2023. "Identifying the Factors Contributing to Freeway Crash Severity Based on Discrete Choice Models," Sustainability, MDPI, vol. 15(3), pages 1-18, January.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:3:p:1805-:d:1039009
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    References listed on IDEAS

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    1. Xiaojun Shao & Xiaoxiang Ma & Feng Chen & Mingtao Song & Xiaodong Pan & Kesi You, 2020. "A Random Parameters Ordered Probit Analysis of Injury Severity in Truck Involved Rear-End Collisions," IJERPH, MDPI, vol. 17(2), pages 1-18, January.
    2. Hou, Qinzhong & Huo, Xiaoyan & Leng, Junqiang & Cheng, Yuxing, 2019. "Examination of driver injury severity in freeway single-vehicle crashes using a mixed logit model with heterogeneity-in-means," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 531(C).
    3. Bercedis Peterson & Frank E. Harrell, 1990. "Partial Proportional Odds Models for Ordinal Response Variables," Journal of the Royal Statistical Society Series C, Royal Statistical Society, vol. 39(2), pages 205-217, June.
    4. Hou, Qinzhong & Meng, Xianghai & Leng, Junqiang & Yu, Lu, 2018. "Application of a random effects negative binomial model to examine crash frequency for freeways in China," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 509(C), pages 937-944.
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