Abstract:The key indicators of longitudinal sectional slope design for bicycle lanes are studied. The focus is on discussing core issues such as the biomechanical characteristics of cycling uphill, braking safety and the difficulty of climbing. By comparing and analyzing the norms of Europe and America with the current standards of China, the design methods of efficiency and safety for complex terrains are proposed. Based on the human power output model, a quantitative relationship between the climbing slope and speed of a cyclist is established. An average person can ride through a 4% slope at a speed of 10 km/h within 5 minutes with an output power of 100 W, which is approximately 800 m long. And the electric bicycles with an output power of over 250 W can climb slopes of 7% to 8% at a speed of 15 km/h until the battery runs out. For downhill design, it is recommended to control the braking sight distance and the length of the shortest vertical curve. The difficulty coefficient of the Tour de France is introduced to assess the difficulty of cycling, providing theoretical support for the optimization of bicycle lane planning.
