Sight Triangle Calculator
Calculate clear sight triangle dimensions for intersection safety based on AASHTO guidelines, design speed, and intersection control type.
Inputs
mph
mph
sec
%
Results
Major Road Leg
152 ft
Minor Road Leg
57 ft
Clear Area4,323 sq ft
Stopping Sight Distance245 ft
Min. Setback20 ft
Driver Eye Height3.5 ft
Object Height3.5 ft
How to Use This Calculator
- Enter Intersection Control, Stop-Controlled, and Yield-Controlled.
- Set Uncontrolled, Major Road Design Speed, and Minor Road Speed.
- Adjust Lanes to Cross, Perception-Reaction Time as needed.
- Review Major Road Leg (ft) and Minor Road Leg (ft).
- Use Clear Area (sq ft) and Stopping Sight Distance (ft) to inform your decision.
Ad Placeholder
Related Calculators
Level of Service (LOS) Calculator
Determine roadway Level of Service grade (A through F) from traffic volume, lane count, free-flow speed, and vehicle mix using HCM methodology.
Speed Hump Design Calculator
Design speed humps, speed tables, or speed cushions with recommended dimensions and spacing for target speed reduction on residential streets.
Pedestrian Signal Timing Calculator
Calculate walk and clearance intervals for pedestrian signal phases from crossing distance and walk speed per MUTCD and ADA standards.
Ad Placeholder