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N AT I O N A L C O O P E R AT I V E H I G H W AY R E S E A R C H P R O G R A M NCHRP RESEARCH REPORT 1068 Right-Turn-on-Red Site Considerations and Capacity Analysis PRACTITIONERâS GUIDE Christopher M. Day John Shaw Arya Haghighat Anuj Sharma Institute for Transportation Iowa State University Ames, IA A. M. Tahsin Emtenan Center for Advanced Transportation Technology (CATT) Laboratory University of Maryland College Park, MD Pat Hawley R. A. Smith, Inc. Brookfield, WI Mark Shields Quality Counts Herndon, VA Subscriber Categories Design â¢ Operations and Traffic Management â¢ Policy Research sponsored by the American Association of State Highway and Transportation Officials in cooperation with the Federal Highway Administration 2023
NATIONAL COOPERATIVE HIGHWAY NCHRP RESEARCH REPORT 1068 RESEARCH PROGRAM Systematic, well-designed, and implementable research is the most Project 03-136 effective way to solve many problems facing state departments of ISSN 2572-3766 (Print) transportation (DOTs) administrators and engineers. Often, highway ISSN 2572-3774 (Online) problems are of local or regional interest and can best be studied by ISBN 978-0-309-69915-0 state DOTs individually or in cooperation with their state universities Library of Congress Control Number 2023945785 and others. However, the accelerating growth of highway transporta- Â© 2023 by the National Academy of Sciences. National Academies of tion results in increasingly complex problems of wide interest to high- Sciences, Engineering, and Medicine and the graphical logo are trade- way authorities. These problems are best studied through a coordinated marks of the National Academy of Sciences. All rights reserved. program of cooperative research. Recognizing this need, the leadership of the American Association of State Highway and Transportation Officials (AASHTO) in 1962 ini- tiated an objective national highway research program using modern COPYRIGHT INFORMATION scientific techniquesâthe National Cooperative Highway Research Authors herein are responsible for the authenticity of their materials and for obtaining Program (NCHRP). NCHRP is supported on a continuing basis by written permissions from publishers or persons who own the copyright to any previously funds from participating member states of AASHTO and receives the published or copyrighted material used herein. full cooperation and support of the Federal Highway Administration Cooperative Research Programs (CRP) grants permission to reproduce material in this (FHWA), United States Department of Transportation, under Agree- publication for classroom and not-for-profit purposes. 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COOPERATIVE RESEARCH PROGRAMS CRP STAFF FOR NCHRP RESEARCH REPORT 1068 Waseem Dekelbab, Deputy Director, Cooperative Research Programs, and Manager, National Cooperative Highway Research Program Arefeh Nasri, Senior Program Officer Stephanie L. Campbell-Chamberlain, Senior Program Assistant Natalie Barnes, Director of Publications Heather DiAngelis, Associate Director of Publications NCHRP PROJECT 03-136 PANEL Field of TrafficâArea of Operations and Control Vicki Sue Haskell, Wisconsin Department of Transportation, Madison, WI (Chair) Julius A. Codjoe, Louisiana Department of Transportation and Development, Baton Rouge, LA Eric Alan Hathaway, City of Ithaca, Ithaca, NY Marcus H. Januario, Shive-Hattery, Cedar Rapids, IA Donald Raymond Sweezy, New York State Department of Transportation, Albany, NY Xianfeng Yang, University of Maryland, College Park, MD Hong Zhang, Louisiana Department of Transportation and Development, Baton Rouge, LA James P. Sturrock, FHWA Liaison Douglas E. Noble, Institute of Transportation Engineers (ITE), Liaison AUTHOR ACKNOWLEDGMENTS The research team wishes to thank the members of the technical advisory panel for suggestions during the execution of this NCHRP project. They also wish to thank several individuals for their consideration, time, and effort in assisting with video data collection: Mark Taylor and colleagues with the Utah Depart- ment of Transportation (UDOT); Shawn Gotfredson with the City of Overland Park, Kansas; Gang Xie with the Regional Transportation Commission of Southern Nevada; Tony Geara with the City of Detroit, Michigan; Brian Guy with the City of Omaha, Nebraska; and April Wire with the Maricopa County DOT (MCDOT) in Arizona.
FOREWORD By Arefeh Nasri Staff Officer Transportation Research Board NCHRP Research Report 1068 presents quantitative models for estimating right-turn- on-red (RTOR) volume and capacity. The developed tools will be of interest to state departments of transportation (DOTs) seeking a consistent approach to analyzing RTOR volume, individuals analyzing traffic control devices and/or maintain highway design manuals, and those who need to estimate RTOR volume and capacity for various traffic analyses purposes. RTOR is permitted as an effective approach to reduce delay at signalized intersections, especially where there is a high volume of right-turn movements. The conflicting interÂ section movements of motorized and nonmotorized users constitute a critical issue that affects signal operation and safety. A method is needed to estimate the RTOR flow volume and its effect on delays because current RTOR estimates are not reliable for planning- or operational-level applications. Gaps in the Highway Capacity Manual (HCM) method include (1) the lack of guidelines on whether RTOR should be implemented or not; (2) the current signal timing model that does not adequately reflect the true operational effects of RTOR; (3) no volume estimation model for right-turn delay; and (4) the pedestrian method that does not consider RTOR flow rate as an input nor does the existing RTOR guidance adequately consider nonmotorized users. As a result, agencies throughout the country have applied different RTOR techniques, which may lead to confusion. The development of an HCM method, therefore, will provide guidance on RTOR implementation and will assist agencies and practitioners by providing a consolidated body of knowledge on RTOR analysis. Under NCHRP Project 03-136, âEvaluating the Performance of Right-Turn-On-Red Operation at Signalized Intersections (with Single and Dual Right-Turn Lanes),â Iowa State University was asked to (1) evaluate methods for evaluating RTOR at signalized intersections (right-turn configurations including shared, single, and dual right-turn lanes); (2) develop methods and tools that consider all modes and inform planning and operational decisions; and (3) provide potential modifications to standard references in the HCM, NCHRP Report 812: Traffic Signal Manual, and the Manual on Uniform Traffic Control Devices (MUTCD). The developed volume and capacity models enhance the state of the practice on RTOR design, support the HCM on RTOR volume estimation and site selection, and provide a better estimation of the delay due to RTOR movements. The output of volume estimation models developed in this study can be directly integrated into existing HCM analysis tools. In addition to NCHRP Research Report 1068, several deliverables that support its implemen- tation are available on the National Academies Press website (nap.nationalacademies.org)
by searching on NCHRP Research Report 1068: Right-Turn-on-Red Site Considerations and Capacity Analysis: Practitionerâs Guide â¢ NCHRP Web-Only Document 368: Right-Turn-on-Red Operation at Signalized Intersections with Single and Dual Right-Turn Lanes: Evaluating Performance, summarizing the projectâs scope, objectives, steps, and research findings, as well as implementation guidelines; â¢ Two spreadsheet tools for practitionersâ use: one applies the RTOR model to a limited set of intersection configurations and allows for volume estimation based on various input scenarios, and the other provides an integration of the RTOR volume calculations into the HCM Computational Engine; and â¢ A PowerPoint presentation summarizing NCHRP Research Report 1068.
CONTENTS 1 Chapter 1â Research Overview 1 1.1â Background and Introduction 2 1.2â Overview of the Spreadsheet Tool 2 1.3â Organization of this Guide 3 Chapter 2â RTOR and No Turn on Red Site Selection 3 2.1âIntroduction 3 2.2â A Survey of RTOR Implementation Guidance 6 2.3â Discussion of Site Considerations 14 2.4â Summary of Considerations for RTOR Site Selection 16 Chapter 3â Spreadsheet Tool 16 3.1âIntroduction 16 3.2â Limitations of the Spreadsheet Tool and Methodologies 17 3.3â Overview of the Spreadsheet Tool 18 3.4â Instructions for Use of the Spreadsheet Tool 26 3.5â Example Application and Comparison of Results 28 3.6â Calculation Sheets 28 3.7â Implementation of RTOR Models in the HCM Computational Engine 32 Chapter 4â Model Details 32 4.1âIntroduction 32 4.2â Volume Estimation Methodology 35 4.3â Capacity Estimation Methodology 38 4.4â Estimation of Delay 39 4.5â Suggested Signal Timing 39 4.6âConclusion 40 References Note: Photographs, figures, and tables in this report may have been converted from color to grayscale for printing. The electronic version of the report (posted on the web at nap.nationalacademies.org) retains the color versions.