Journal
TRAFFIC INJURY PREVENTION
Volume 14, Issue 6, Pages 630-638Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/15389588.2012.736649
Keywords
vehicle-pedestrian crashes; count models; overdisperion; hurdle model; model selection criteria
Funding
- Universiti Sains Malaysia
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Objectives: The objective of this study was to examine the effects of various roadway characteristics on the incidence of pedestrian-vehicle crashes by developing a set of crash prediction models on 543km of Malaysia federal roads over a 4-year time span between 2007 and 2010. Methods: Four count models including the Poisson, negative binomial (NB), hurdle Poisson (HP), and hurdle negative binomial (HNB) models were developed and compared to model the number of pedestrian crashes. Results and Conclusions: The results indicated the presence of overdispersion in the pedestrian crashes (PCs) and showed that it is due to excess zero rather than variability in the crash data. To handle the issue, the hurdle Poisson model was found to be the best model among the considered models in terms of comparative measures. Moreover, the variables average daily traffic, heavy vehicle traffic, speed limit, land use, and area type were significantly associated with PCs.
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