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This document discusses different types of sight distances that must be provided in highway design, including stopping sight distance (SSD), passing sight distance (PSD), and decision sight distance (DSD). It provides the formulas for calculating SSD based on vehicle speed, grade, and perception-reaction time. PSD must allow enough distance for a vehicle to safely pass another on a two-lane road, while DSD gives drivers enough visibility at complex locations to maneuver without stopping. Worked examples are

Author

Taha Gargoum

Language

EN