Inputs
Method — AASHTO
- SSD = 0.278·V·t + V²/(254·(f ± 0.01·G)).
- PSD ≈ 4.5·V (rural two-lane simplified). AASHTO 2011: PSD by phase formula.
- f decreases with speed; default 0.32 at 80 km/h.
Results
Reaction distance—
Braking distance—
SSD—
PSD (4.5·V)—