The highway is the product of social and economic development, to shorten the temporal and spatial distance between people, by providing great convenience for quick travel and communication, while also promoting the economic development and the progress of society. With the rapid economic development, the highway construction has entered an unprecedented fast lane., The number of accidents occurred on the highway is gradually increasing. The fog weather is an important influencing factor on the accidents. Therefore, it is very important to study the driving safety under foggy conditions .In this paper, experimental points are set on different function areas in Sanxikou overpass segment of Chongqing, to evaluate the driver 's and passenger 's true feelings while driving down the road in the foggy condition. From the experiment, it is found that the ecological restoration & ingenious landscape structure along both sides of the mountainous areas, which matches well with the linear pattern has certain guiding effect on the traffic safety in foggy days, to reduce the accident incidence under a heavy fog condition and to ensure driving safety. The guiding function of the ecological restoration & ingenious landscape structure along highways should be considered in the design and the construction of mountainous area highways in fog-prone areas.