| 设计速度(km/h) | 120 | 100 | 80 | 60 | 50 | 40 | 30 | |
| 圆曲线最小半径(一般值) (m) | 1000 | 700 | 400 | 200 | 100 | 65 | 30 | |
| 圆曲线最小半径(极限值) (m) | ih(max) = 4% | 810 | 500 | 300 | 150 | 65 | 40 | 20 |
| ih(max) = 6% | 710 | 440 | 270 | 135 | 60 | 35 | 15 | |
| ih(max) = 8% | 650 | 400 | 250 | 125 | 60 | 30 | 15 | |
| ih(max) = 10% | 570 | 360 | 220 | 115 | — | — | — | |