13. Sight Distance
The chapter discusses the importance of sight distance in ensuring safe and efficient vehicle operation on roads. It introduces various types of sight distances including stopping sight distance, overtaking sight distance, and headlight sight distance, highlighting the factors influencing these measurements. Additionally, the chapter provides mathematical equations to calculate these distances and emphasizes design considerations for different road gradients and vehicle characteristics.
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Sections
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What we have learnt
- Sight distance is critical for safe vehicle operation on highways.
- Different types of sight distances include stopping, overtaking, and headlight sight distances, each with unique calculations.
- Factors such as vehicle speed, reaction time, and road gradient significantly affect sight distance.
Key Concepts
- -- Stopping Sight Distance (SSD)
- The minimum distance required for a driver to stop a vehicle safely without colliding with obstacles.
- -- Overtaking Sight Distance (OSD)
- The distance needed for a driver to safely overtake another vehicle in the presence of oncoming traffic.
- -- Headlight Sight Distance (HSD)
- The distance a driver can see under the illumination of vehicle headlights during night driving.
- -- Reaction Time
- The period taken for a driver to perceive a hazard and begin the braking process.
- -- Frictional Resistance
- The resistance between the vehicle tires and the road that affects stopping distance.
Additional Learning Materials
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