Accident Reduction Effectiveness of Safety Management Programs for a Commercial Transport Company

This study discusses the effectiveness of safety management programs resulted from examining crash data collected during the period of implementation of the programs by a commercial transport company. For the analysis, two tye of comparison approaches are adopted: 1) a study comparing before-after of the implementation of a safety program, and 2) a study comparing a traffic accident index for various target groups. Technically, the effect of the safety management program is derived by eliminating both the 'regression to the mean' and the changing trend in the traffic accident index. The results show that safety management programs are effective to prevent traffic accidents, whereas company type appears irrelevant. The results also show that the effectiveness is significantly different depending on the intensity of safety management program and company size. In addition, a reciprocal effect is very likely to existamong the combination of these variables. This indicates that in order to improve the accident reduction effectiveness of such programs, the development and application of safety management programs based on both safety management strength and company size are required.