Regulations on the slope of bicycle ramps and car ramps

The slope of bicycle ramps should not exceed 1:8, and the slope of car ramps should not exceed 1:5.
Slope is the degree to which the surface unit is steep and gentle. The ratio of the vertical height h of the slope to the horizontal distance l is usually called the slope (or slope ratio) and is represented by the letter i.
There are four methods for expressing slope: percentage method, degree method, density method, and fraction method, among which percentage method and degree method are more commonly used.
Percentage method
The most commonly used method for representing slope is the percentage of the elevation difference between two points and their distance.
The calculation formula is as follows: slope=(elevation difference/distance) x100%
When expressed in percentage,
Namely: i=h/l × 100%
For example, a slope of 3% refers to a vertical increase (decrease) of 3 meters for every 100 meters of travel; 1% refers to a vertical increase (decrease) of 1 meter for every 100 meters of travel. And so on.
Degree method
The slope is expressed in degrees and calculated by Trigonometric functions. The formula is as follows:
Slope=tan α (Slope angle)=elevation difference/distance
therefore α (Slope angle)=arc tan (slope)=arc tan (elevation difference/distance)
Tangent and sine slopes at different angles
Angle tangent sine
0 ° 0% 0%; 5 ° 9% 9%; 10 ° 18% 17%; 30 ° 58% 50%; 45 ° 100% 71%; 60 ° 87%; 90 ° ∞ 100%