Traffic Signal Timing

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					Traffic Signal Timing Manual

  AASHTO Subcommittee on Traffic Engineering
                  Mobile, AL
                 June 16, 2008

                                    Eddie Curtis, P.E.
                        FHWA Resource Center / HOTM
 Practical and easy to use resource for practitioners
 involved in the day-to-day timing and coordination of traffic
    Principals of signal timing in the context of planning, design,
    operations & maintenance
    Improve traffic signal timing terminology

 Consolidate signal timing fundamentals that are
 documented but also not adequately understood

 * No new research to be incorporated
Signal Timing Manual Project Team
Federal Highway Administration
     Eddie Curtis, John Halkias HOTM
     Paul Olson, Ed Fok Resource Center
Consultant Team
  Kittelson & Associates, Inc.
      • Peter Koonce, Principal Investigator
     Texas Transportation Institute
     University of Maryland
     Purdue University
     Siemens ITS
     University of Tennessee, Tom Urbanik
Peer Review Panel
  FHWA Internal Peer Review Panel
     Eddie Curtis        Fred Ranck         Scott Wainwright
     Paul Olson          Edward Fok         John Halkias
     Raj Ghaman          David Gibson       Davey Warren
     Mike Schauer

  External Peer Review Panel
   Rick Denney, Iteris              Gary Duncan, Econolite
   Woody Hood, MD SHA               Denny Eyler, SRF Consulting
   Bill Kloos, City of Portland     Michael Kyte, Univ of Idaho
   James Pond, Monroe County        Susan Langdon, Savant Group
   Ziad Sabra, Sabra-Wang           Avery Rhodes, City of Glendale
   Sean Skehan, City of LA          Jim Sturdevant, INDOT
   Bruce Zvaniga, City of Toronto
1. Introduction
2. Policy
3. Operations and Safety Analysis
4. Design
5. Isolated Signal Timing
6. Coordination
7. Timing Plan Development
8. Maintenance
9. Advanced Topics
Chapter 1 - Introduction
   Organization of the Manual
   How to use the manual

   Utilize several resources
      ITE Manual of Signal Design
      NCHRP efforts (172 Synthesis, 457)
      State DOT Manuals
      Experience of Project Team
Chapter 2 - Policy
 Objective: Introduce concept of policy based
 signal control and relate signal timing to
 political and other processes

    Regional Transportation Policies should guide
    our objectives for traffic signal timing
    Specific locations may have different needs
    Signal Timing Process identifies steps and
    articulates a plan for achieving objectives
Signal Timing Policy and Practices
    What we intend to do

    What we actually do

    What is in the field
Chapter 2 – Policy
Link to Chapter 7
  Project Scoping
  Data Collection
  Model Development
  Performance Measurement
  Policy Confirmation
  Assessment and Reporting
Chapter 3 – Operations and Safety
 Objective: Describe basic concepts such as critical movement
 analysis that are fundamental
    Used for allocation of green and split estimation
 Addresses evaluation of efficiency and safety
Chapter 4 - Traffic Signal Design
 Objective: Establish terminology and introduce key
 concepts as a building block to traffic signal operations
    Examples: Ring and Barrier Diagram and Detection Layout
Chapter 5 – Basic Signal Timing
 Objective: Describe settings that are prevalent at actuated
 intersections and provide guidance
    Vehicle Phase Intervals
    Pedestrian Timing Requirements
    Actuated Phase Parameters
    Detector Settings
    Volume-Density Features
    Cycle Length
    Time-Base Controls
 Fixed time operation is ultimately a function of settings
Logic for Actuated Signal Timing
Chapter 6 – Coordinated Timing
 Objective: Describe coordination timing concepts and
 provide guidance for developing signal timing plans
    Coordinated phase assignment
    Cycle length
    Green time allocation
     • Splits and Force_off
     • Other factors
    Coordination Complexities
Chapter 7 – Signal Timing Development
 Objective: Describe
 details of the signal
 timing process
Chapter 8 – Maintenance of Signal Timing

 Objective: Describe issues related to Day to Day Operations
    Signal retiming
    Responding to Citizens
    Incidents and Planned Special Events
    Staff training and overall needs
Chapter 9 - Advanced Topics
 Objective: Describe concepts of advanced topics in a
 summary format
    Traffic signal preemption
    Traffic signal priority
    Transition logic
    Traffic responsive
    Adaptive traffic signal control
    Planned Special Event, Incident, & Emergency Management
    Weather-related factors that influence signal timing
Status & Availability

 508 Compliance pending

 Download preliminary version

     Eddie Curtis