The Truck Escape Ramp Design Method On The Mountainous Expressway Downhill Section

Vehicles traveling downhill grew up in a row, in order to maintain a certain speed and the safety of the vehicle in front to keep a safe distance. the driver must implement continuous braking. Continuous braking make rapid increasing in temperature of the brake, brake performance degradation, causing the vehicle brake failure, causing loss of control. Now grow up in order to avoid vehicle accidents caused by out of control downhill taken various measures, including the emergency lane at home and abroad is considered to solve the continuous growth downhill brake failure caused the accident vehicle the best way to. However, due to huge investment hedge lane, high maintenance costs, thus setting a reasonable emergency lane is particularly important.This article first of the current situation and development prospects of highways has made the introduction, That with China's highway to the western mountains, the development of economically underdeveloped areas, the situation will be worsening traffic safety,Comprehensive study of mountain highway safety issue is very important. Grew up on the freeway and then downhill all aspects of the existing security problems were analyzed. And then analyzed for heavy goods vehicles driving downhill in the law of growth, Grow up from the vehicle braking downhill start to analyze the reasons for failure. In the clear premise of brake failure temperature, resulting in the vehicle grew up downhill braking distance and time away from the top of the hill slope, the relationship between vehicle speeds is calculated.In order to facilitate the use of the specific design of the emergency lane of the theory as calculated on the basis set, In this paper, from the top of the slope failure by braking distance and slope, the relationship between vehicle speed after the formula, The introduction of the concept of design speed to the formula for speed to be replaced, resulting in a more practical design with practicalFinally, even the state of Guangdong Province Lianzhou to Huaiji the A2 highway project design section K59 +800 ~ K72 +300 and K109 +000 ~ K116 +800 section of the two grew up in the emergency lane to set the longitudinal position of the analysis process,Progressive adoption of the proposed method to analyze. Combined with practical design problems for linear routes, terrain, structures before and after the set and other factors, on the set location for further screening. And discussed the specific design of the emergency lane to the situation.