What are the standards for car ramp gradients?

[NicoleAnn]

The standard for ramp gradients is generally no more than 15%, with a gentle slope of 7.5% within a straight section of 3.6 meters at the entrance and exit, and a curved gentle slope of 7.5% within 2.4 meters. Below is more information about ramps: Gentle slope gradient: The entrance and exit should have a gentle slope of no less than 7.5 meters with a gradient of 7.5% connecting to the basement floor, and a buffer of no less than 7.5 meters with a gradient of 7.5% connecting to the outdoor ground. The middle section can have a maximum gradient of 15%, with the length of the slope determined by the indoor-outdoor height difference. Safety distance: When the entrance and exit of an underground garage are perpendicular to the road, a safety distance of no less than 7.50 meters should be maintained between the entrance/exit and the road boundary line. Additionally, there should be a 2-meter unobstructed line-of-sight requirement, totaling 9.5 meters of unobstructed visibility.