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Title: Comparative Analysis of Safety Impacts of Pavement Surface Roughness at Two-Lane and Multilane Highways: Accounting for Heterogeneity and Seemingly Unrelated Correlation Across Crash Severities
Accession Number: 01658884
Record Type: Component
Abstract: For purposes of project evaluation, safety audits, and project appraisal, highway agencies seek to establish the relationship between road safety and road-related factors including pavement condition. In addition, agencies show interest in measuring and comparing the strength of the safety influence of pavement surface roughness across the different highway classes. To this end, this paper estimates random-parameters seemingly-unrelated negative binomial regression (RPSUNB) models to account for the unobserved heterogeneity and correlation in the crash frequency across three levels of crash severity. Also, univariate negative binomial models were estimated for both highway classes for the purposes of comparison with the RPSUNB models. It was found that at multi-lane highways, the pavement condition generally has a far more significant impact on the number of crashes compared to two-lane highways. This result could be due to the effect of risk compensation where drivers offset the safety hazard associated with inherently less safe situations by driving more carefully. For both highway classes, a number of traffic and road geometric covariates were found to significantly influence the number of crashes of various severities. In addition, the RPSUNB models outperform their univariate counterparts, thus confirming the efficacy of the former in addressing seemingly-unrelated correlation among the three severity levels. In sum, the paper throws more light on the effects of pavement roughness on highway crashes and establishes that the influence of this crash factor differs significantly across two-lane and multi-lane roads. The results can be useful in road safety audits, evaluation of the safety impacts of past or anticipated projects that improve in pavement condition, and assessing the safety consequences of delayed pavement rehabilitation.
Supplemental Notes: This paper was sponsored by TRB committee ANB20 Standing Committee on Safety Data, Analysis and Evaluation.
Report/Paper Numbers: 18-02152
Language: English
Authors: Pagination: 7p
Publication Date: 2018
Conference:
Transportation Research Board 97th Annual Meeting
Location:
Washington DC, United States Media Type: Digital/other
Features: References
(32)
; Tables
TRT Terms: Subject Areas: Highways; Pavements; Safety and Human Factors
Source Data: Transportation Research Board Annual Meeting 2018 Paper #18-02152
Files: TRIS, TRB, ATRI
Created Date: Jan 8 2018 10:31AM
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0000-0002-5931-5619