| Speeds after application of reduction coefficient (km/h) | ||||
---|---|---|---|---|---|
Class | Slope value (%) | Associated speed (km/h) | Two-lane road | Single-lane road | Passageway, path, stairs, unsurfaced track |
Reduction coefficient | Â | Â | 1 | 0.8 | 0.5 |
1 | <  3 | 4.85 | 4.85 | 3.88 | 2.43 |
2 | [3–6[ | 4.55 | 4.55 | 3.64 | 2.28 |
3 | [6–9[ | 4.26 | 4.26 | 3.41 | 2.13 |
4 | [9–12[ | 3.97 | 3.97 | 3.18 | 1.99 |
5 | [12–15[ | 3.69 | 3.69 | 2.95 | 1.85 |
6 | [15–18[ | 3.42 | 3.42 | 2.74 | 1.71 |
7 | [18–21[ | 3.15 | 3.15 | 2.52 | 1.58 |
8 | [21–24[ | 2.90 | 2.90 | 2.32 | 1.45 |
9 | [24–27[ | 2.65 | 2.65 | 2.12 | 1.33 |
10 | ≥ 27 | 1.71 | 1.71 | 1.37 | 0.86 |