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Copyright © 2015 Cuiping Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

There tend to be more crashes occurring in freeway diverging segments due to increasing traffic conflicts between diverging vehicles and nondiverging vehicles. The diverging segments have a safety impact on the precedent basic segments and the following off ramps. It is always a challenge to accurately define the safety influential area of freeway diverging segments. In previous studies, fixed buffer in size is pregiven for crash frequency analysis in diverging segments, which lacks theoretical and practical support. In this study, the safety influential area was investigated from the statistical point of view. Data from a geocoded GIS crash database for Colorado Springs metropolitan area was used; the statistically significant factors associated with crash frequency were examined for the spatial influence of freeway diverging segments. Also, the generalized linear models with negative binomial link function were applied to predict the crash frequency for freeway diverging segments and off ramps based on the influential area. The results may give some insights into the causation of crashes on diverging segments and off-ramp intersections.

Details

Title
Spatial Influence Analysis of Traffic Safety in Diverging Areas between Freeway Segments and Off Ramps
Author
Zhang, Cuiping; Yan, Xuedong; An, Meiwu; Zhao, Hui
Publication year
2015
Publication date
2015
Publisher
John Wiley & Sons, Inc.
ISSN
10260226
e-ISSN
1607887X
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
1750366888
Copyright
Copyright © 2015 Cuiping Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.