常张高速公路是湖南省第一条旅游高速公路 ,同时也是该省通往西部的第一条山区高速公路 ,在交通量预测、选线、路面结构型式、绿化美化等方面的设计既要满足工程需要又要突出旅游公路特色。 Chang-Zhang Expressway is the first tourist highway in Hunan Province and the first mountainous expressway to the west of the province. The design of traffic volume forecasting, route selection, pavement structure type, afforestation and beautification should be satisfied Engineering needs but also highlight the characteristics of tourist roads.