What is the appropriate slope height for car passage at the entrance?
2 Answers
Generally, it should not exceed 15%. The straight gentle slope within 3.6 meters at the entrance and exit should be 7.5%, and the curved gentle slope within 2.4 meters should also be 7.5%. This prevents the front and rear chassis of the vehicle from scraping. Relevant introduction to car ramp slopes: Straight ramp: The ramp width should not be less than 1200, and the slope should not exceed 1:12. Double-turn ramp: The ramp width is 1200, the slope is 1:12, and the depth of the ramp start, end, and rest platform is 1500. L-shaped ramp: The ramp width is 1200, the slope is less than 1:12, and the depth of the ramp start, end, and rest platform is 1500. Slopes greater than 10%: When the slope exceeds 10%, gentle slopes should be set at both the upper and lower ends. The horizontal length of the straight gentle slope section should not be less than 3.6m, and the gentle slope gradient should be half of the ramp slope. The horizontal length of the curved gentle slope section should not be less than 2.4m, the curve radius should not be less than 20m, and the midpoint of the gentle slope section should be the original start or end point of the ramp.
During my driving days, I found that the steep slope at my doorstep is really troublesome. Small cars often scrape their chassis when passing, especially low-clearance models. The ideal slope should not exceed 15%, with around 10% being optimal. If it's too steep, say above 20%, vehicles struggle when going uphill, and braking becomes less stable when going downhill, with a higher risk of tire slippage during heavy rain. I once measured the slope at my doorstep with a simple level and found even 15% too steep. After reducing it to 8%, entry and exit became much smoother, and the lifespan of car parts extended. Adding anti-slip pavement or small buffer steps can prevent accidents—safety first. Also, remember that longer slopes require gentler gradients to avoid overburdening the engine and to protect your beloved car.
