ITE Traffic Signal Timing Manual by olliegoblue26


									An Overview of the
   FHWA Signal
  Timing Manual

   Peter Koonce, P.E.
   Kittelson & Associates, Inc.

   Develop a resource for professionals involved in traffic
   signal timing that:
    – integrates consideration of planning, design, operations, and
    – considers the needs of technicians, engineers, and planners
    – improves traffic signal timing terminology
   Document signal timing fundamentals and nuances
   that are not adequately understood
   First Edition of the Signal Timing Manual is a
   compilation of existing resources
Signal Timing Manual Project Team

 Federal Highway Administration
    – Eddie Curtis
    – Resource Center Staff
 Consultant Team lead by Kittelson & Associates, Inc.
    – Peter Koonce, Principal Investigator
    – Assistance from Texas Transportation Institute and University of Maryland
    –   Purdue University
    –   Siemens ITS
    –   Institute of Transportation Engineers
    –   Tom Urbanik
Signal Timing Manual Peer Review Panel

   Bill Kloos, City of Portland
   Rick Denney, Iteris
   Ziad Sabra, Sabra Wang
   Woody Hood, Maryland State Highway
   Bruce Zvaniga, City of Toronto
   Susan Langdon, Savant
   James Pond, Monroe County
   Denny Eyler, SRF Consulting
   Jim Poston, RTC
   Mike Kyte, University of Idaho
   Gary Duncan, Econolite
   Avery Rhodes, City of Glendale
Signal Timing Manual Outline of Chapters

 1.   Introduction
 2.   Policy and Funding
 3.   Operations
 4.   Design
 5.   Isolated Signal Timing
 6.   Coordination
 7.   Timing Plan Development
 8.   Maintenance
 9.   Advanced Topics
Chapter 1 - Introduction

    Develop a resource that can improve practice

    Compilation of resources
     –   National Traffic Signal Report Card
     –   ITE Manual of Signal Design
     –   ITE Traffic Engineering Handbook
     –   NCHRP efforts (172 Synthesis, 457)
     –   Vendor Controller Manuals
     –   State DOT Manuals
     –   Mobile Hands On Signal Timing (MOST)
Chapter 2 - Policy

   Regional Transportation Policies should
   guide our objectives for traffic signal

   Specific locations may have different

   A Signal Timing Process identifies steps
   and articulates a plan for achiving
Chapter 2 - Policy

   Project Scoping
   Data Collection
   Model Development
   Performance Measurement
   Policy Confirmation
   Assessment and Reporting
Policies vs. Practices

   Policies would be not only what the value is, but also
    – It may also include what circumstances result in change
   How long does it take to get from Point A to B?
    – Vehicles, pedestrians, transit
   What’s the reliability of that travel?
Chapter 3 – Operations and Safety

   Describes basic concepts for traffic signal timing and
   relates it to operations decisions
    – Critical movement analysis techniques
    – Intersection performance measures
Chapter 4 - Traffic Signal Design

   Ring and Barrier Diagram
   Detection Layout
Chapter 5 – Basic Signal Timing

 Describes settings that are prevalent at actuated
  –   Vehicle Phase Intervals
  –   Pedestrian Timing Requirements
  –   Actuated Phase Parameters
  –   Detector Settings
  –   Volume-Density Features
  –   Cycle Length
  –   Time-Base Controls
Chapter 4 & 5 Questions

   How many detectors?
    – Consider tradeoff between type, maintenance, and functionality
   Where do you place detectors and why?
   What detector timing parameters should be used in
   support of detection?
Chapter 6 – Coordinated Timing

   Coordinated phase assignment
   Cycle length
   Green time allocation
    – Splits and Forceoff
    – Other factors
   Coordination Complexities
Chapter 6 – Coordinated Timing
Chapter 7 – Signal Timing Development

   Describes details of the
   signal timing process
   Identify key elements
   for data collection
   Highlights the
   importance of field
   implementation and
Chapter 8 – Maintenance of Signal Timing

   Describes issues related to Day to Day Operations
    –   Signal retiming
    –   Responding to Citizens
    –   Incidents and Planned Special Events
    –   Staff training
   Summarizes staffing needs based on previous research
   FHWA will be releasing a forthcoming document:
   Traffic Signal Operations and Maintenance Staffing
Chapter 9 - Advanced Topics

   Traffic signal preemption
   Traffic signal priority
   Transition logic
   Traffic responsive
   Adaptive traffic signal control
   Planned Special Event, Incident, & Emergency
   Weather-related factors that influence signal timing
Signal Timing Manual is Available Online

   Available online as a pdf
    – On Federal Highway Administration Office Of Operations website, or
    – Google: Signal Timing Manual
   ITE is producing a bound version to be released soon
Lessons Learned from the Signal Timing Manual

   Begin with the end in mind
    – Use policies to guide the development of signal timing plans
   Improve the data
    – Take advantage of information from detection where possible
    – Use advanced techniques to provide additional information
   Increase understanding of the signal controller
    – Incorporate techniques such as the University of Idaho’s MOST
    – Invest time out in the field
Contact information

   Peter Koonce, P.E.
    Kittelson & Associates, Inc.
    610 SW Alder Street, Suite 700
    Portland, Oregon 97205

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