中文摘要：

针对高速公路雾天低能见度及路面附着系数减小的情况，进行安全车速研究。根据跟车状态下停车过程及标志视认相关方法，分别进行基于停车视距模型（包括AASHT0停车视距模型和NCHRP停车视距模型）和基于交通标志认知距离的安全车速计算。以湖北黄黄高速公路为例，综合3种模型条件下安全车速，最终得出雾天气候下的交通管理措施。

英文摘要：

This paper studied the safe vehicular velocity in foggy weather with consideration of poor visibility and road adhesion coefficient＇s reducing on expressway. Accoring to shuton process of following states and traffic sign＇s cognition on expressway, calculation of safe vehicular velocity based on stopping sight distance model （including stopping sight distance model of AASHTO and NCHRP） and traffic sign＇s cognition distance were carried on. Finally, Huanghuang expressway was selected as the example, the safe vehicular velocity of three model conditions were synthetically considered, the traffic management measures were obtained for reference.