Traffic Signal Timing Manual

Traffic Signal Timing Manual AASHTO Subcommittee on Traffic Engineering Mobile, AL June 16, 2008 Eddie Curtis, P.E. FHWA Resource Center / HOTM Obj...
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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

Objective ƒ 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

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

ƒ * 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 ƒ 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 ƒ 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

ƒ 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 ƒ Background ƒ Organization of the Manual ƒ How to use the manual ƒ 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 ƒ 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 ƒ Policy ¾ What we intend to do

ƒ Practice ¾ What we actually do

ƒ Reality ¾ What is in the field

Chapter 2 – Policy Link to Chapter 7 ƒ Project Scoping ƒ Data Collection ƒ Model Development ƒ Implementation ƒ Evaluation ƒ Performance Measurement ƒ Policy Confirmation ƒ Assessment and Reporting

Chapter 3 – Operations and Safety ƒ Objective: Describe basic concepts such as critical movement analysis that are fundamental ¾ Used for allocation of green and split estimation

ƒ Addresses evaluation of efficiency and safety

Chapter 4 - Traffic Signal Design ƒ 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 ƒ 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

ƒ Fixed time operation is ultimately a function of settings

Logic for Actuated Signal Timing

Chapter 6 – Coordinated Timing ƒ 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 ƒ Objective: Describe details of the signal timing process

Chapter 8 – Maintenance of Signal Timing ƒ 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 ƒ 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 ƒ 508 Compliance pending

ƒ Download preliminary version

¾www.signaltiming.com ¾ Questions Eddie Curtis [email protected]