Analysis of maximum slope length limit of separated section of mountain road

Highways;  Split cross-section;  slope length limit;  vehicle dynamics;  operating speed;  Profile design

Starting from the automobile driving theory, taking the Jiefang CA141 truck as the standard model, the dynamic nature of the car, the force and motion equation of the vehicle on the road are analyzed, and the various influencing factors such as air resistance, altitude and vehicle load are fully considered when the car is exposed to the uphill and downhill, and the method of determining the maximum slope length limit of mountain roads is discussed. Based on the analysis results, the suggestions that the maximum slope length limit should be appropriately relaxed > the technical standards of China’s < highway engineering are put forward, and the recommended value for modifying the maximum slope length limit of mountain roads is given (and the correctness of the analysis is verified by experiments) for designers to refer to in the design process.