基于高速公路交通影响的雾天预测研究

Fog weather has a significant impact on freeway traffic safety, and mastering foggy weather appears feature is a key issue for improving the management effectiveness. According to 2009-2011 fog seasons' traffic data and weather data of freeways in Chongqing, and based on the analysis in operating speed, a traffic effect threshold of fog visibility as 600m is identified. A principal component analysis and correlation analysis on the formation time evolution of meteorological conditions for fog generating showed that the maximum humidity and temperature difference between day and night have a decisive impact on the formation of fog. Finally, a odds ration model of fog days prediction was built, the model can be used for fog forecasting, and provides decision supporting for expressways management in fog days.