关键词: 雾灾害, 运营, 高速公路网, 危害性指数

Abstract: The relative data from expressways of Shanghai-Chongqing ( G5001 ) and Chongqing-Kunming ( G85 ) in Chongqing such as the weather，the information got by traffic testing facilities and the management information in foggy day got by Chongqing highway road network，are adopted to analyze the impact of foggy weather on highway traffic. And hazardous degree of highway road network is estimated. The research shows that: for G85，the running speed loss is 7% to 61%，volume loss is 6% to 95%; the values are 4% to 29% and 24% to 93% for G5001. Relying on principal component analysis method and cluster analysis and synthesizing the frequency of fog，the severity of fog’s influence and the traffic level of segments，the index calculation model for estimating fog hazardous impact on expressway has been established and the grading standard of fog’s hazardous impact has been also proposed. The index calculation model and the grading standard mentioned above have been applied to 146 management units of Chongqing’s expressway network，which include 19 special key segments，24 key segments and 49 minor key segments.

Key words: fog hazard, operation, expressway network, hazardous index