A STUDY ON THE EFFECT OF SAFETY PROGRAM ON TRAFFIC ACCIDENT REDUCTION

Japanese government conducted the project of empirical survey on the effect of safety programs at 3,196 sites with frequent accident occurrence for 5 years from 1996 to reduce the number of accidents. However, the effect of sort of program on the accident reduction by accident type was not analyzed deeply. This study aims at the post-evaluation of safety programs on accident reduction at 1,713 intersections. The accident factors are hypothesized though the basic data analyses. These hypotheses are verified by two statistical analyses, cross tabulation analysis and t-test. It is found out that the downsizing at intersection possibly reduces the number of human-vehicle type accidents, while right-turn related improvement induces this sort of accident. Besides, several trade-offs of accident reduction among safety programs are found. Finally, the mechanisms of accident occurrence under the circumstantial change by safety programs are considered by microscopic viewpoints.