Traffic Signal Timing Manual AASHTO Subcommittee on Traffic Engineering Mobile, AL June 16, 2008
Eddie Curtis, P.E. FHWA Resource Center / HOTM
Objective Practical and easy to use resource for practitioners involved in the day-to-day timing and coordination of traffic signals ¾ Principals of signal timing in the context of planning, design, operations & maintenance ¾ 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 ¾ Eddie Curtis, John Halkias HOTM ¾ Paul Olson, Ed Fok Resource Center
Consultant Team Kittelson & Associates, Inc. • Peter Koonce, Principal Investigator
¾ ¾ ¾ ¾ ¾
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 Paul Olson Raj Ghaman Mike Schauer
Fred Ranck Edward Fok David Gibson
Scott Wainwright John Halkias Davey Warren
External Peer Review Panel Rick Denney, Iteris Woody Hood, MD SHA Bill Kloos, City of Portland James Pond, Monroe County Ziad Sabra, Sabra-Wang Sean Skehan, City of LA Bruce Zvaniga, City of Toronto
Gary Duncan, Econolite Denny Eyler, SRF Consulting Michael Kyte, Univ of Idaho Susan Langdon, Savant Group Avery Rhodes, City of Glendale Jim Sturdevant, INDOT
Chapters 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 Background Organization of the Manual How to use the manual Utilize several resources ¾ ¾ ¾ ¾
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 ¾ Regional Transportation Policies should guide our objectives for traffic signal timing ¾ Specific locations may have different needs ¾ Signal Timing Process identifies steps and articulates a plan for achieving objectives
Signal Timing Policy and Practices Policy ¾ What we intend to do
Practice ¾ What we actually do
Reality ¾ What is in the field
Chapter 2 – Policy Link to Chapter 7 Project Scoping Data Collection Model Development Implementation Evaluation Performance Measurement Policy Confirmation Assessment and Reporting
Chapter 3 – Operations and Safety Objective: Describe basic concepts such as critical movement analysis that are fundamental ¾ 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 ¾ 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 ¾ ¾ ¾ ¾ ¾ ¾ ¾
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 ¾ Coordinated phase assignment ¾ Cycle length ¾ Green time allocation • Splits and Force_off • Other factors
¾ 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 ¾ ¾ ¾ ¾
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 ¾ ¾ ¾ ¾ ¾ ¾ ¾
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
¾www.signaltiming.com ¾ Questions Eddie Curtis
[email protected]