Transportation Engineering - Vol 1 | 18. Vertical Alignment - 2 by Abraham | Learn Smarter
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Knowledge
18. Vertical Alignment - 2

The chapter discusses the importance of valley curves in transportation engineering, specifically focusing on their design considerations, length, and geometric adjustments needed for safety and comfort. It explains how valley curves are formed by different gradient combinations and how factors like sight distance and headlight operation play crucial roles in their design, especially at night. Proper design of these curves is essential to reduce vehicle discomfort and enhance visibility to prevent accidents.

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Sections

  • 18

    Vertical Alignment - 2

    This section covers valley curves, their design and length considerations, focusing on their significance in transportation engineering.

    Learning Practice

  • 18.1

    Overview

    This section introduces valley curves, emphasizing their importance in handling changes in topography within roadway design.

    Learning Practice

  • 18.2

    Valley Curve

    This section discusses valley curves, their types, design considerations, and how they impact vehicle dynamics and visibility.

    Learning Practice

  • 18.2.1

    Design Considerations

    This section outlines essential design considerations for valley curves in transportation engineering, particularly concerning visibility and vehicle comfort.

    Learning Practice

  • 18.2.2

    Length Of The Valley Curve

    This section focuses on the design length of valley curves, considering comfort and safety criteria.

    Learning Practice

  • 18.2.2.1

    Comfort Criteria

    This section focuses on the comfort criteria for valley curves in transportation engineering, emphasizing the rate of change of centrifugal acceleration for passenger comfort.

    Learning Practice

  • 18.2.2.2

    Safety Criteria

    This section discusses the safety criteria for valley curves in road design, emphasizing the importance of headlight sight distance.

    Learning Practice

  • 18.2.2.2.1

    Case 1 Length Of Valley Curve Greater Than Stopping Sight Distance (L>s)

    This section discusses valley curves where the length exceeds stopping sight distance, emphasizing geometric design considerations for safety and comfort.

    Learning Practice

  • 18.2.2.2.2

    Case 2 Length Of Valley Curve Less Than Stopping Sight Distance (L<S)

    This section explains the conditions when the length of a valley curve is less than the stopping sight distance and its implications on design.

    Learning Practice

  • 18.3

    Summary

    The section highlights the importance of designing valley curves to ensure adequate headlight sight distance and prevent riding discomfort and accidents, especially at night.

    Learning Practice

  • 18.4

    Problems

    This section provides sample problems related to valley curves and their design.

    Learning

References

18.pdf

Class Notes

Memorization

What we have learnt

  • Valley curves are vertical ...
  • Designing valley curves req...
  • The length of the valley cu...

Final Test

Revision Tests