Sight Distance Calculator
Calculate Stopping Sight Distance (SSD) and Overtaking Sight Distance (OSD) per KRDM/KeRRA
Stopping Sight Distance
85m
SSD = Vt + V²/254(f+g)
Overtaking Sight Distance
298m
OSD ≈ 3.5 × SSD
Curve Radius Check
SSD vs curve radius:✓ Adequate
Minimum SSD (per KRDM2017)
| Speed (km/h) | SSD (m) | OSD (m) |
|---|---|---|
| 30 | 30m | 105m |
| 40 | 45m | 158m |
| 50 | 65m | 228m |
| 60 | 85m | 298m |
| 70 | 110m | 385m |
| 80 | 140m | 490m |
| 90 | 175m | 613m |
| 100 | 215m | 753m |
| 110 | 260m | 910m |
| 120 | 305m | 1068m |