What are the ramp slope specifications?
2 Answers
The standard ramp slope should generally not exceed 15%. At the entrance and exit, the straight gentle slope within 3.6 meters is 7.5%, and the curved gentle slope within 2.4 meters is 7.5%. Here is more information about ramps: 1. The distance between the entrance and exit of an underground garage and the intersection of the base road or the starting point of the elevated road should not be less than 7.50m, with a slope of 7.5%. 2. A gentle slope of no less than 7.5 meters with a 7.5% gradient should be set between the entrance/exit and the garage floor, as well as a buffer zone of no less than 7.5 meters with a 7.5% gradient to the outdoor ground. The maximum slope in the middle section is 15%, and the length of the slope is determined by the indoor-outdoor elevation difference. 3. When the entrance and exit of an underground garage are perpendicular to the road, a safety distance of no less than 7.50m should be maintained from the road boundary line. Additionally, there should be a 2-meter unobstructed sightline requirement, totaling 9.5 meters of unobstructed visibility.
I usually work with road engineering design, where ramp gradient specifications must be strictly followed during the design phase. For example, the maximum gradient for urban roads is typically no more than 8%, while parking lots are best kept within 5%-7%. Excessively steep gradients can pose safety hazards—when the gradient exceeds 10%, small vehicles are prone to rolling back, and braking systems may fail. We refer to national standards such as the 'Urban Road Engineering Design Code' to ensure gentle gradients combined with curve design, allowing all vehicles to safely ascend and descend. These specifications are not arbitrary; they are based on accident data and testing. In practical applications, factors like ramp length and vehicle type must also be considered—for instance, large trucks require gentler gradients. Safety is the top priority, so it's advisable to slow down on steep slopes and avoid sudden braking.