Transportation Engineering - Vol 2 | 20. Trafic Signal Design - I by Abraham | Learn Smarter
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Knowledge
20. Trafic Signal Design - I

Traffic signal design involves managing traffic flow at intersections through fixed or vehicle-actuated controls. The design process includes understanding various terms and procedures such as phase design, cycle length determination, and effective green time calculation. Key challenges include minimizing delays and safely handling conflicting movements while maximizing intersection capacity.

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Sections

  • 41

    Traffic Signal Design-I

    This section discusses the fundamentals of traffic signal design, including signal cycles, phases, and the procedures necessary for effective intersection management.

    Learning Practice

  • 41.1

    Overview

    This section discusses the advantages and disadvantages of traffic signal design, highlighting its role in managing traffic at intersections.

    Learning Practice

  • 41.2

    Definitions And Notations

    This section outlines essential definitions and notations used in traffic signal design to facilitate understanding of signal operations.

    Learning Practice

  • 41.3

    Signal Design Procedure

    The signal design procedure is essential in traffic signal planning, comprising six key steps to ensure safe and efficient traffic flow.

    Learning Practice

  • 41.3.1

    Two Phase Signals

    This section discusses the design and implementation of two-phase traffic signals, particularly when through traffic is significant compared to turning movements.

    Learning Practice

  • 41.3.2

    Four Phase Signals

    This section explains the design and application of four-phase traffic signals at intersections, focusing on the various phasing options and their importance for traffic management.

    Learning Practice

  • 41.4

    Interval Design

    Interval design pertains to the change and clearance intervals at traffic signals, crucial for safe traffic movement.

    Learning Practice

  • 41.5

    Cycle Time

    Cycle time refers to the duration needed for a traffic signal to complete one full cycle of all signal indications.

    Learning Practice

  • 41.5.1

    Effective Green Time

    Effective green time is a critical factor in traffic signal design that combines actual green time with interval durations while accounting for lost time.

    Learning Practice

  • 41.5.2

    Lane Capacity

    This section discusses the calculation of lane capacity in traffic signal design, focusing on the relationship between effective green time, cycle time, and saturation flow rate.

    Learning Practice

  • 41.5.3

    Critical Lane

    The critical lane refers to the most intense traffic lane during a green signal phase, requiring more time than any other lane.

    Learning Practice

  • 41.6

    Determination Of Cycle Length

    This section discusses the determination of cycle length in traffic signal design, highlighting its integral role in effective signal management.

    Learning Practice

  • 41.7

    Summary

    Traffic signals manage the flow of traffic at intersections to enhance safety and order.

    Learning Practice

  • 41.8

    Problems

    This section provides problems that require applying traffic signal design concepts.

    Learning Practice

References

41.pdf

Class Notes

Memorization

What we have learnt

  • Traffic signals enable orde...
  • Understanding cycle length ...
  • Both change and clearance i...

Final Test

Revision Tests