State of Georgia - Georgia Department of Transportation

1 State of Georgia Department of Transportation Traffic Signal Design Guidelines Traffic Signal Design Guidelines 10/28/2016. Atlanta, Georgia 30308. This document was developed as part of the continuing effort to provide guidance within the Georgia Department of Transportation in fulfilling its mission to provide a safe, efficient, and sustainable Transportation system through dedicated teamwork and responsible leadership supporting economic development, environmental sensitivity and improved quality of life.

2 This document is not intended to establish policy within the Department , but to provide guidance in adhering to the policies of the Department . Your comments, suggestions, and ideas for improvements are welcomed. Please send comments to: State Design Policy Engineer Georgia Department of Transportation One Georgia Center 600 W. Peachtree Street, 26th Floor Atlanta, Georgia 30308. DISCLAIMER. The Georgia Department of Transportation maintains this printable document and is solely responsible for ensuring that it is equivalent to the approved Department guidelines.

3 Intentionally Left Blank Traffic Signal Design Guidelines Revision History Revision Number Revision Date Revision Summary 11/2000 Initial release of document 5/2003 Draft of first major update 11/2003 Final of first major update 2/2011 Major update 12/2013 Major update 8/2015 Major update 10/2015 Minor changes to Rev. 2/2016 Minor Update Page 10: Traffic signal strain poles should be designed to provide adequate clearance for the addition of future left turn phases. Page 26-27; 37: Signal head and blank-out sign treatments for railroad pre-emption.

4 Page 35: The assignment of side street phases for split phase intersections. Page 35: Consideration should be given to avoid creating a left turn trap when entering the pre-emption sequence. Page 39; B-5: Signal head treatment for shared through/left travel lanes. Page 39: Minimum requirements and engineering judgment for the installation of supplemental signal heads. Page 40: Configuration of bi-modal FYA signal heads, bottom section should display both the green and flashing yellow indications. Page 45: Options for the installation of atypical vehicle detection.

5 Page A-5: Design example for radar vehicle detection. 10/2016 Reformatted manual to standard template Page i Traffic Signal Design Guidelines Intentionally Left Blank Page ii Traffic Signal Design Guidelines List of Effective Chapters Document Revision Number Revision Date List of Effective Chapters Original 10/28/16. Table of Contents 10/28/16. Acronyms 10/28/16. Chapter 1. Introduction 10/28/16. Chapter 2. General Information 10/28/16. Chapter 3. Traffic Signal Poles 10/28/16. Chapter 4. Overhead Support Structures 10/28/16.

6 Chapter 5. Pedestrian Infrastructure 10/28/16. Chapter 6. Cabinet Assemblies 10/28/16. Chapter 7. Communication/Interconnect 10/28/16. Chapter 8. Wiring Standards 10/28/16. Chapter 9. Conduit and Pullboxes 10/28/16. Chapter 10. Traffic Signal Related Signs 10/28/16. Chapter 11. Pavement Markings 10/28/16. Chapter 12. Traffic Signal Phasing 10/28/16. Chapter 13. Vehicular Signals 10/28/16. Chapter 14. Pedestrian Signal Heads 10/28/16. Chapter 15. Vehicular Detection 10/28/16. Appendix A. Traffic Signal Plan Examples 10/28/16.

7 Appendix B. Vehicular Signal Head Placement Examples 10/28/16. Appendix C. Signal Interconnect Pay Items 10/28/16. Appendix D. Examples of Signal Head Detail Cells 10/28/16. Rev List of Effective Chapters 10/28/16 Page v Traffic Signal Design Guidelines Intentionally Left Blank Rev List of Effective Chapters 10/28/16 Page vi Traffic Signal Design Guidelines Table of Contents Revision History .. i List of Effective Chapters .. v Table of vii Acronyms .. ix Chapter 1. Introduction - Contents .. 1-i Applicable Standards and Specifications.

8 1-1. Chapter 2. General Information - 2-i Signal Permitting Process .. 2-1. Signal Design Process .. 2-1. General Signal Plan Presentation .. 2-2. Signal Design Plans (Section 27-000) .. 2-2. Signal Upgrade Project .. 2-3. Site 2-4. List of Materials/Pay Items .. 2-4. Trenching and 2-5. Chapter 3. Traffic Signal Poles - Contents .. 3-i Pole 3-1. Strain Poles .. 3-1. Timber 3-1. Joint Use Poles .. 3-1. Chapter 4. Overhead Support Structures - Contents .. 4-i Span Wire Configuration .. 4-1. Mast Arm Configuration.

9 4-1. Chapter 5. Pedestrian Infrastructure - Contents .. 5-i Pedestrian Push Button Assembly .. 5-1. Curb 5-2. Pedestrian Refuge Islands .. 5-3. Other Pedestrian Active Control .. 5-4. Chapter 6. Cabinet Assemblies - 6-i Cabinet and Cabinet Bases .. 6-1. Input File .. 6-1. Cabinet Input Assignments .. 6-1. Battery Backup/Uninterruptable Power 6-3. Power Disconnect .. 6-3. Chapter 7. Communication/Interconnect - Contents .. 7-i Rev Table of Contents 10/28/16 Page vii Traffic Signal Design Guidelines Chapter 8.

10 Wiring Standards - Contents .. 8-i Chapter 9. Conduit and Pullboxes - Contents .. 9-i Chapter 10. Traffic Signal Related Signs - Contents .. 10-i Regulatory Signs .. 10-1. Pedestrian Signs .. 10-3. Overhead Street Name Signs .. 10-4. Chapter 11. Pavement Markings - 11-i Chapter 12. Traffic Signal Phasing - Contents .. 12-i Left Turn Phasing .. 12-3. Right Turn 12-3. Split Phasing .. 12-4. Pre-emption .. 12-4. Railroad Pre-emption .. 12-5. Emergency Vehicle Pre-emption .. 12-6. Chapter 13. Vehicular Signals - 13-i Signal Placement.