Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.14279/34020
Title: Prediction of secondary crash frequency on highway networks
Authors: Sarker, Afrid A. 
Paleti, Rajesh 
Mishra, Sabyasachee 
Golias, Mihalis 
Freeze, Philip B. 
Major Field of Science: Engineering and Technology
Keywords: Secondary crash frequency;Count models;Prediction model;GORP;Segment characteristics;Freeways
Issue Date: 1-Jan-2017
Source: Accident Analysis and Prevention, vol.98, p.108-117, 2017
Volume: 98
Start page: 108
End page: 117
Journal: Accident Analysis and Prevention 
Abstract: Secondary crash (SC) occurrences are major contributors to traffic delay and reduced safety, particularly in urban areas. National, state, and local agencies are investing substantial amount of resources to identify and mitigate secondary crashes to reduce congestion, related fatalities, injuries, and property damages. Though a relatively small portion of all crashes are secondary, determining the primary contributing factors for their occurrence is crucial. The non-recurring nature of SCs makes it imperative to predict their occurrences for effective incident management. In this context, the objective of this study is to develop prediction models to better understand causal factors inducing SCs. Given the count nature of secondary crash frequency data, the authors used count modeling methods including the standard Poisson and Negative Binomial (NB) models and their generalized variants to analyze secondary crash occurrences. Specifically, Generalized Ordered Response Probit (GORP) framework that subsumes standard count models as special cases and provides additional flexibility thus improving predictive accuracy were used in this study. The models developed account for possible effects of geometric design features, traffic composition and exposure, land use and other segment related attributes on frequency of SCs on freeways. The models were estimated using data from Shelby County, TN and results show that annual average daily traffic (AADT), traffic composition, land use, number of lanes, right side shoulder width, posted speed limits and ramp indicator are among key variables that effect SC occurrences. Also, the elasticity effects of these different factors were also computed to quantify their magnitude of impact.
URI: https://hdl.handle.net/20.500.14279/34020
ISSN: 00014575
DOI: 10.1016/j.aap.2016.09.019
Type: Article
Affiliation : University of Memphis 
Old Dominion University 
Tennessee Department of Transportation 
Publication Type: Peer Reviewed
Appears in Collections:Άρθρα/Articles

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