Influence of adverse weather on vehicle trip at freeway

In order to analyzing the relations of vehicle trip probability with weather condition, trip distance and transportation safety facilities, the paper surveyed the number of vehicle trip at Shang-Kai freeway in severe weather, set up the regress models of vehicle trip probability with weather condition and trip distance. The complex correlativity coefficient of the models is 84%. Based on the influence of transportation safety facilities on the models, the paper summarized a compositive math model of vehicle trip probability. The results indicate that the vehicle trip probability has a direct proportion relation with trip distance and inverse proportion relation with severe weather condition, their influence degrees are 10%~50%. 3 tabs, 3 figs, 6 refs.