Study on the Relationship between Speed Difference and Crash Rate on Freeway

This paper studied the relationship between speed differences and crash rates using nine of China's freeway speed and accident data. Research shows that the accident rate has correlations with the dispersion of speed. According to the accident rate and speed scatter Distribution, three kinds of models will be carried out, analyzing the significant level of F, as well as R2 amendment. The authors arrived at the index distribution model of accident rate and speed standard deviation.