// multi-utility computation suite · offline · instant · precise
┌──────────────────────────┐
│ [c] calcalyst_ │
│ computation suite │
└──────────────────────────┘
// select a module to initialize
/ search↵ open firstesc close
// adsenseEMPTY_LEADER_SLOT728×90
// adsenseMOBILE_ANCHOR_SLOT320×50
// keyboard_shortcuts
/focus search
↑↓navigate module list
Enter
open first result from search
open highlighted
compute when module is open
compute when focused in a field
Escclose module · clear selection
⌫
eng.road-design-sight-distance Calculator
Calculates stopping sight distance, passing sight distance, and decision sight distance from design speed using AASHTO formulae. Stopping sight distance must be provided everywhere on a road — restricted sight distance zones require speed reduction or physical restrictions.
Inputs
Speed Km H
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 Coeff
Reference formula or conversion factor shown for context.
Grade Pct
Reference formula or conversion factor shown for context.
Results
stopping sight distance SSD (m)
The computed distance or separation.
passing sight distance PSD (approx, 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 100 km/h SSD
Reference formula or conversion factor shown for context.