// multi-utility computation suite · offline · instant · precise
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eng.vehicle-stopping-distance Calculator
Calculates vehicle stopping distance from perception-reaction time, initial speed, and deceleration rate on dry and wet roads. AASHTO stopping sight distance uses 2.5 s reaction time and 0.35g deceleration on wet pavement — design provides the 85th percentile driver performance.
Inputs
Speed Kmh
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
Reaction Time S
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Friction Coefficient
Reference formula or conversion factor shown for context.
Grade Pct
Reference formula or conversion factor shown for context.
Results
total stopping distance (m)
The computed distance or separation.
reaction distance (m)
The computed distance or separation.
braking distance (m)
The computed distance or separation.
deceleration (m/s²)
The proportional relationship between two quantities.
ABS threshold
Reference formula or conversion factor shown for context.