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Title:

Impacts of Influential Factors on Vehicle-to-Vehicle Crash Frequency and Severity in Rainy Weather

Accession Number:

01477238

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

This study combined vehicle to vehicle crash frequency and severity estimations to examine factor impacts on Wisconsin highway safety in rainy weather. Primary tasks for this study were conducted as follows. Due to data deficiency, real-time rainfall intensity, water film depth, stopping sight distance, deficiency of car-following distance, and vertical curve grade were estimated through available data sources and GIS analysis to capture rainy weather conditions at the crash location and time. For crash frequency, a negative binomial regression model was estimated while ordered logit and multinomial logit models were compared for crash severity estimation. In crash frequency estimation, average annual daily traffic per lane and the interaction between posted speed limit change and off-ramp existence were found to increase the likelihood of vehicle to vehicle crash occurrences under rainfall. However, more average monthly rainfall and a wider left shoulder width were identified as factors that decrease the likelihood of vehicle to vehicle crash occurrences. In crash severity estimation, higher speed limit, driver's lateral lane control, and no use of safety belt were found to increase the likelihood of severe crashes, especially fatal, incapacitating, and non-incapacitating crashes under rainfall in the multinomial logit model that outperformed the ordered logit model. As an exploratory data analysis, this study provide insight into potential strategies for rainy weather highway safety improvement. The following weather sensitive strategies could prove effective: education enhancement, road design, and intelligent transportation system implementation for driver's safety awareness under rainfall.

Supplemental Notes:

This paper was sponsored by TRB committee AH010 Surface Transportation Weather.

Monograph Accession #:

01470560

Report/Paper Numbers:

13-3308

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Jung, Soyoung
Jang, Kitae
Yoon, Yoonjin
Kang, Sanghyeok

Pagination:

20p

Publication Date:

2013

Conference:

Transportation Research Board 92nd Annual Meeting

Location: Washington DC, United States
Date: 2013-1-13 to 2013-1-17
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References; Tables

Geographic Terms:

Wisconsin

Subject Areas:

Highways; Safety and Human Factors; I81: Accident Statistics

Source Data:

Transportation Research Board Annual Meeting 2013 Paper #13-3308

Files:

TRIS, TRB, ATRI

Created Date:

Feb 5 2013 12:40PM