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http://dx.doi.org/10.7855/IJHE.2013.15.2.131

Analysis of Accident Factors at Arterial Roads Using Tobit Model  

Kim, Kyung Hwan (ChungBuk National University)
Park, Byung Ho (ChungBuk National University)
Publication Information
International Journal of Highway Engineering / v.15, no.2, 2013 , pp. 131-138 More about this Journal
Abstract
PURPOSES : The intents of the study are to identify the accident factors and to demonstrate the potentials of tobit model as a tool to study the number of accidents on arterial roads segments. METHODS : This paper uses a tobit regression as a methodology to analyze the factors affecting the number of accidents. In pursuing the above goal, this study gives particular attentions to analyzing the data of 2,446 accidents (1,610 in major arterial roads and 836 in minor arterial roads) occurred on arterial roads in 2007 to 2010. RESULTS : First, 3 accident models which were classified by total arterial roads, major arterial roads and minor arterial roads, and were all statistically significant were developed. Second, the exclusive right-turn lane as common variable, and the number of accident, traffic volume, number of lanes, link length, rate of median, number of entrances, number of pedestrian crossings, number of curves, number of bus stops and exclusive left-turn as specific variables of the models were selected. Finally, the paired sample t-test could not be rejected the null hypotheses of three types of models. CONCLUSIONS : Using data from vehicle accidents on arterial roads, the estimation results show that many factors related to roadway geometrics and traffic characteristics significantly affect to the number of accidents.
Keywords
accident model; arterial road; paired sample t-test; RMSE(Root Mean Square Error); tobit model;
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Times Cited By KSCI : 4  (Citation Analysis)
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