Variables | Categories | Estimated values |
AADT [41] | ≤5500 vpd >5500 vpd | 1 2 |
Curve radius (m) [42] | ≤600 600 - 1500 >1500 | 3 2 1 |
Grade (%) [36] | Negative, Positive, or Zero | 3 1 |
Segment length (m) [43] | ≤200 200-1000 ≥1000 | 1 2 3 |