Stopping distance
Total stopping distance is roughly reaction distance + braking distance:
s = v·t + v² ÷ (2·a)
Wet surfaces and laden trucks need longer distances — use conservative deceleration.
Vehicle Stopping Distance Calculator
Fleet · think + brake
Estimate total stopping distance: s = v·t + v²/(2·a).
Formula: s = v·t + v² ÷ (2·a)
Frequently asked questions
Typical reaction time?
About 1–1.5 s for alert drivers; fatigue and distraction increase it.
Deceleration values?
Dry car ~6–8 m/s² possible; wet/site traffic often plan nearer 3–5 m/s².
Pedestrians?
Site speed limits and segregation beat relying on stopping maths alone.
ABS / grades?
Hills and vehicle systems change real stopping — this is a flat-ground estimate.
