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Cycle Length

This document provides an in-depth analysis of traffic signal timing parameters, focusing on cycle lengths, split times for various signal phases, and the relationship between master and local clocks. It includes considerations for both actuated and pretimed operations, detailing minimum and maximum green intervals, gap timers, and vehicle extension timers. Special attention is given to vehicle trajectories and decision zones in time-space diagrams to enhance traffic flow efficiency and safety.

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Cycle Length

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  1. Cycle Length North Cycle Length Split Time (Green + Yellow + All-Red)

  2. Pretimed Operation North Unused Green Unused Green

  3. Actuated Operation North Programmed N/S Split Time Programmed E/W Split Time Actuated Cycle Length

  4. Gap Timer (1/2 speed) Detector (Pulse Mode) Ugh! 5 GAP OUT 4 1 3 2 Vehicle Extension Timer

  5. Minimum Green…. 10 20 15 25 3 Min Green GAP OUT Max Green 2 1

  6. Maximum Green…. 10 20 15 25 3 Min Green MAX OUT Max Green 2 1

  7. Traffic Signal Timing & Phasing • Relationship between the Master Clock, Local Clock, and Offset

  8. Traffic Signal Timing & Phasing • Vehicle Trajectory on Time Space Diagram

  9. Decision Zone (1/2 speed) 5 Seconds 2 Seconds Aww…Come On! Decision Zone

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