Generally speaking, the gradient is limited based on vehicle speed. When the design speed is 120km/h, 100km/h, 80km/h, 60km/h, 40km/h, 30km/h, 20km/h, the limit value of the slope is 3% to 10%, and the maximum slope is in snowy and cold areas. The recommended value is no more than 6%.
The maximum slope is 10%. By consulting official information, we learned that the slope of sidewalks in my country can be divided into transverse slopes and longitudinal slopes. The maximum slope of a transverse slope shall not exceed 3%, and the maximum slope of a longitudinal slope shall not exceed 10%.
According to the road grade, the lowest grade 4 highway has a maximum slope of 9%. If it exceeds, you will have to wait for the outer road. Many mountainous roads are out-of-class roads with gradients as high as 20%. Treatment of mountain landscape roads. When the road gradient is within 6%, it can be treated as a normal road.
The slope is the ratio of the height difference between the starting and ending points of the slope to its horizontal distance. The maximum value is 90 degrees. The slope is the degree of steepness and gentleness of the surface unit. Usually the ratio of the vertical height h of the slope surface to the horizontal distance l is called the slope with the letter i. express.
The maximum longitudinal slope of 9% is suitable for low-speed driving in mountainous and hilly areas of fourth-class highways; the maximum longitudinal slopes of 5%, 6%, and 7% are suitable for calculated driving speeds of 80, 60, and 40km/h.