// multi-utility computation suite · offline · instant · precise
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eng.stopping-sight-distance Calculator
Calculates stopping sight distance and decision sight distance per AASHTO Green Book from design speed and road conditions. Decision sight distance is longer than SSD — it's required at complex decision points where drivers must perceive, evaluate, and respond to a hazard.
Inputs
V Km H
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
T React S
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
F Friction
A multiplier applied in the calculation.
G Pct
Reference formula or conversion factor shown for context.
Results
stopping sight distance SSD (m)
The computed distance or separation.
reaction distance (m)
The computed distance or separation.
braking distance (m)
The computed distance or separation.
SSD = V·t + V²/[2g(f±G)]
Reference formula or conversion factor shown for context.
AASHTO design SSD at 100 km/h
The value at the specified point or condition.
grade effect
Letter or numerical grade indicating quality, creditworthiness, or performance on a defined scale.