// multi-utility computation suite · offline · instant · precise
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eng.stopping-sight-distance-AASHTO Calculator
Calculates stopping sight distance from AASHTO standards using design speed, perception-reaction time, and braking deceleration. AASHTO SSD uses 2.5 s reaction time and 0.35g braking deceleration — the resulting distances range from 20m at 20 km/h to 250m at 130 km/h.
Inputs
V Km H
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
A Decel M S2
Amount per unit of time or per unit quantity. Check the denominator before interpreting.
T React S
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Grade Pct
Reference formula or conversion factor shown for context.
Results
stopping sight distance SSD (m)
The computed distance or separation.
reaction distance d_r (m)
The computed distance or separation.
braking distance d_b (m)
The computed distance or separation.
SSD = V·t + V²/2(a±g·G)
Reference formula or conversion factor shown for context.
AASHTO design value at 120 km/h
The computed numeric or monetary value.
grade effect
Letter or numerical grade indicating quality, creditworthiness, or performance on a defined scale.