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

摘要： 应用沪渝高速公路重庆绕城段( G5001) 和渝昆高速公路( G85) 重庆段上的天气、交通检测设施采集到的信息以及重庆高速公路路网的雾天管理信息，分析了雾对高速公路交通的影响，并对高速公路路网雾区路段的雾灾害严重程度进行了评价。研究表明: 不同能见度下雾使G85 高速公路重庆段运行车速降低7% ～ 61%，流量损失6% ～95%，G5001 运行车速降低4% ～ 29%，流量损失24% ～ 93%。综合考虑雾的出现频率和严重程度以及路段交通水平，采用主成分分析及聚类分法建立了高速公路雾灾害严重影响程度指数计算模型，提出雾灾害指数的分级标准。对重庆高速公路网146 个管理单元的雾灾害指数进行了评价和分级，确定特别关键路段19 个，关键路段24 个，次关键路段49 个。

关键词: 雾灾害, 运营, 高速公路网, 危害性指数