An analysis was performed on the relationship between traffic accidents and road characteristics using a multivariate procedure, i.e., quantitative theory. By dividing Root 2 within Hiroshima Prefecture into each 1km section, the number of accidents and the factors which represent the characteristics of the road were investigated. Those factors were such twelve ones as traffic density, number of traffic signal, width of the road, number of pedestrian crosswalk, and so forth.
The results indicate that; (1) the wider the road is the more the traffic accidents occur which may be from free-style maneuvering, (2) number of pedestrian crosswalk and of traffic signal relates to the number of rear-end collisions, and (3) speed of vehicle correlates with number of death and wound.
According to our first finding, the road design of Root 31 which had partially two-lanes on one side was changed into one-lane system throughout. Within a half year after the new design was applied, the number of traffic accident reduced about by half.
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