Sight Distance Analysis

AUSTROADS/NZTA

Stopping Sight Distance (SSD)

Operating speed of the road
Positive for uphill, negative for downhill
Typically 2.5s for design
Friction coefficient for braking

Common Design Speeds

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About Sight Distance

Critical sight distances for safe road design:

  • SSD: Minimum distance to stop safely
  • PSD: Distance needed for safe overtaking
  • ISD: Visibility at intersections
Standards: Based on AUSTROADS Part 3 and NZTA guidelines

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