Calculate total stopping distance including driver reaction time, brake system delay, and deceleration distance.
Input Parameters
Results
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Reaction Distance
ft
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Braking Distance
ft
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Total Stopping Distance
ft
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Deceleration
g
Note: NHTSA average reaction time is 1.5 seconds. At 60 mph, reaction distance alone is 132 ft. ABS prevents wheel lockup but does not shorten stopping distance on dry pavement.
Reference
Reaction Distance = Speed(ft/s) x Reaction Time
Decel (g) = mu x cos(grade) + sin(grade)
Braking Distance = V² / (2 x Decel x 32.174)
Total = Reaction + Braking Distance
Typical mu: Dry 0.7-0.8, Wet 0.4-0.5, Ice 0.1-0.2