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NATIONAL NCHRP REPORT 683 COOPERATIVE HIGHWAY RESEARCH PROGRAM Protocols for Collecting and Using Traffic Data in Bridge Design

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TRANSPORTATION RESEARCH BOARD 2011 EXECUTIVE COMMITTEE* OFFICERS CHAIR: Neil J. Pedersen, Administrator, Maryland State Highway Administration, Baltimore VICE CHAIR: Sandra Rosenbloom, Professor of Planning, University of Arizona, Tucson EXECUTIVE DIRECTOR: Robert E. Skinner, Jr., Transportation Research Board MEMBERS J. Barry Barker, Executive Director, Transit Authority of River City, Louisville, KY Deborah H. Butler, Executive Vice President, Planning, and CIO, Norfolk Southern Corporation, Norfolk, VA William A.V. Clark, Professor, Department of Geography, University of California, Los Angeles Eugene A. Conti, Jr., Secretary of Transportation, North Carolina DOT, Raleigh James M. Crites, Executive Vice President of Operations, Dallas-Fort Worth International Airport, TX Paula J. Hammond, Secretary, Washington State DOT, Olympia Adib K. Kanafani, Cahill Professor of Civil Engineering, University of California, Berkeley Susan Martinovich, Director, Nevada DOT, Carson City Michael R. Morris, Director of Transportation, North Central Texas Council of Governments, Arlington Tracy L. Rosser, Vice President, Regional General Manager, Wal-Mart Stores, Inc., Mandeville, LA Steven T. Scalzo, Chief Operating Officer, Marine Resources Group, Seattle, WA Henry G. (Gerry) Schwartz, Jr., Chairman (retired), Jacobs/Sverdrup Civil, Inc., St. Louis, MO Beverly A. Scott, General Manager and CEO, Metropolitan Atlanta Rapid Transit Authority, Atlanta, GA David Seltzer, Principal, Mercator Advisors LLC, Philadelphia, PA Lawrence A. Selzer, President and CEO, The Conservation Fund, Arlington, VA Kumares C. Sinha, Olson Distinguished Professor of Civil Engineering, Purdue University, West Lafayette, IN Daniel Sperling, Professor of Civil Engineering and Environmental Science and Policy; Director, Institute of Transportation Studies; and Interim Director, Energy Efficiency Center, University of California, Davis Kirk T. Steudle, Director, Michigan DOT, Lansing Douglas W. Stotlar, President and CEO, Con-Way, Inc., Ann Arbor, MI C. Michael Walton, Ernest H. Cockrell Centennial Chair in Engineering, University of Texas, Austin EX OFFICIO MEMBERS Peter H. Appel, Administrator, Research and Innovative Technology Administration, U.S.DOT J. Randolph Babbitt, Administrator, Federal Aviation Administration, U.S.DOT Rebecca M. Brewster, President and COO, American Transportation Research Institute, Smyrna, GA Anne S. Ferro, Administrator, Federal Motor Carrier Safety Administration, U.S.DOT John T. Gray, Senior Vice President, Policy and Economics, Association of American Railroads, Washington, DC John C. Horsley, Executive Director, American Association of State Highway and Transportation Officials, Washington, DC David T. Matsuda, Deputy Administrator, Maritime Administration, U.S.DOT Victor M. Mendez, Administrator, Federal Highway Administration, U.S.DOT William W. Millar, President, American Public Transportation Association, Washington, DC Tara O'Toole, Under Secretary for Science and Technology, U.S. Department of Homeland Security, Washington, DC Robert J. Papp (Adm., U.S. Coast Guard), Commandant, U.S. Coast Guard, U.S. Department of Homeland Security, Washington, DC Cynthia L. Quarterman, Administrator, Pipeline and Hazardous Materials Safety Administration, U.S.DOT Peter M. Rogoff, Administrator, Federal Transit Administration, U.S.DOT David L. Strickland, Administrator, National Highway Traffic Safety Administration, U.S.DOT Joseph C. Szabo, Administrator, Federal Railroad Administration, U.S.DOT Polly Trottenberg, Assistant Secretary for Transportation Policy, U.S.DOT Robert L. Van Antwerp (Lt. Gen., U.S. Army), Chief of Engineers and Commanding General, U.S. Army Corps of Engineers, Washington, DC Barry R. Wallerstein, Executive Officer, South Coast Air Quality Management District, Diamond Bar, CA *Membership as of March 2011.

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NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM NCHRP REPORT 683 Protocols for Collecting and Using Traffic Data in Bridge Design Bala Sivakumar HNTB CORPORATION New York, NY Michel Ghosn New York, NY Fred Moses Pittsburgh, PA TranSystems Corporation Kansas City, MO Subscriber Categories Highways Bridges and Other Structures Research sponsored by the American Association of State Highway and Transportation Officials in cooperation with the Federal Highway Administration TRANSPORTATION RESEARCH BOARD WASHINGTON, D.C. 2011 www.TRB.org

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NATIONAL COOPERATIVE HIGHWAY NCHRP REPORT 683 RESEARCH PROGRAM Systematic, well-designed research provides the most effective Project 12-76(01) approach to the solution of many problems facing highway ISSN 0077-5614 administrators and engineers. Often, highway problems are of local ISBN 978-0-309-15547-2 interest and can best be studied by highway departments individually Library of Congress Control Number 2011923476 or in cooperation with their state universities and others. However, the 2011 National Academy of Sciences. All rights reserved. accelerating growth of highway transportation develops increasingly complex problems of wide interest to highway authorities. These problems are best studied through a coordinated program of COPYRIGHT INFORMATION cooperative research. Authors herein are responsible for the authenticity of their materials and for obtaining In recognition of these needs, the highway administrators of the written permissions from publishers or persons who own the copyright to any previously American Association of State Highway and Transportation Officials published or copyrighted material used herein. initiated in 1962 an objective national highway research program Cooperative Research Programs (CRP) grants permission to reproduce material in this employing modern scientific techniques. This program is supported on publication for classroom and not-for-profit purposes. Permission is given with the understanding that none of the material will be used to imply TRB, AASHTO, FAA, FHWA, a continuing basis by funds from participating member states of the FMCSA, FTA, or Transit Development Corporation endorsement of a particular product, Association and it receives the full cooperation and support of the method, or practice. It is expected that those reproducing the material in this document for Federal Highway Administration, United States Department of educational and not-for-profit uses will give appropriate acknowledgment of the source of any reprinted or reproduced material. For other uses of the material, request permission Transportation. from CRP. The Transportation Research Board of the National Academies was requested by the Association to administer the research program because of the Board's recognized objectivity and understanding of NOTICE modern research practices. The Board is uniquely suited for this purpose as it maintains an extensive committee structure from which The project that is the subject of this report was a part of the National Cooperative Highway Research Program, conducted by the Transportation Research Board with the approval of authorities on any highway transportation subject may be drawn; it the Governing Board of the National Research Council. possesses avenues of communications and cooperation with federal, The members of the technical panel selected to monitor this project and to review this state and local governmental agencies, universities, and industry; its report were chosen for their special competencies and with regard for appropriate balance. relationship to the National Research Council is an insurance of The report was reviewed by the technical panel and accepted for publication according to procedures established and overseen by the Transportation Research Board and approved objectivity; it maintains a full-time research correlation staff of by the Governing Board of the National Research Council. specialists in highway transportation matters to bring the findings of The opinions and conclusions expressed or implied in this report are those of the research directly to those who are in a position to use them. researchers who performed the research and are not necessarily those of the Transportation The program is developed on the basis of research needs identified Research Board, the National Research Council, or the program sponsors. by chief administrators of the highway and transportation departments The Transportation Research Board of the National Academies, the National Research and by committees of AASHTO. Each year, specific areas of research Council, and the sponsors of the National Cooperative Highway Research Program do not needs to be included in the program are proposed to the National endorse products or manufacturers. Trade or manufacturers' names appear herein solely because they are considered essential to the object of the report. Research Council and the Board by the American Association of State Highway and Transportation Officials. Research projects to fulfill these needs are defined by the Board, and qualified research agencies are selected from those that have submitted proposals. Administration and surveillance of research contracts are the responsibilities of the National Research Council and the Transportation Research Board. The needs for highway research are many, and the National Cooperative Highway Research Program can make significant contributions to the solution of highway transportation problems of mutual concern to many responsible groups. The program, however, is intended to complement rather than to substitute for or duplicate other highway research programs. Published reports of the NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM are available from: Transportation Research Board Business Office 500 Fifth Street, NW Washington, DC 20001 and can be ordered through the Internet at: http://www.national-academies.org/trb/bookstore Printed in the United States of America

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The National Academy of Sciences is a private, nonprofit, self-perpetuating society of distinguished scholars engaged in scientific and engineering research, dedicated to the furtherance of science and technology and to their use for the general welfare. On the authority of the charter granted to it by the Congress in 1863, the Academy has a mandate that requires it to advise the federal government on scientific and technical matters. Dr. Ralph J. Cicerone is president of the National Academy of Sciences. The National Academy of Engineering was established in 1964, under the charter of the National Academy of Sciences, as a parallel organization of outstanding engineers. It is autonomous in its administration and in the selection of its members, sharing with the National Academy of Sciences the responsibility for advising the federal government. The National Academy of Engineering also sponsors engineering programs aimed at meeting national needs, encourages education and research, and recognizes the superior achievements of engineers. Dr. Charles M. Vest is president of the National Academy of Engineering. The Institute of Medicine was established in 1970 by the National Academy of Sciences to secure the services of eminent members of appropriate professions in the examination of policy matters pertaining to the health of the public. The Institute acts under the responsibility given to the National Academy of Sciences by its congressional charter to be an adviser to the federal government and, on its own initiative, to identify issues of medical care, research, and education. Dr. Harvey V. Fineberg is president of the Institute of Medicine. The National Research Council was organized by the National Academy of Sciences in 1916 to associate the broad community of science and technology with the Academy's purposes of furthering knowledge and advising the federal government. Functioning in accordance with general policies determined by the Academy, the Council has become the principal operating agency of both the National Academy of Sciences and the National Academy of Engineering in providing services to the government, the public, and the scientific and engineering communities. The Council is administered jointly by both Academies and the Institute of Medicine. Dr. Ralph J. Cicerone and Dr. Charles M. Vest are chair and vice chair, respectively, of the National Research Council. The Transportation Research Board is one of six major divisions of the National Research Council. The mission of the Transporta- tion Research Board is to provide leadership in transportation innovation and progress through research and information exchange, conducted within a setting that is objective, interdisciplinary, and multimodal. The Board's varied activities annually engage about 7,000 engineers, scientists, and other transportation researchers and practitioners from the public and private sectors and academia, all of whom contribute their expertise in the public interest. The program is supported by state transportation departments, federal agencies including the component administrations of the U.S. Department of Transportation, and other organizations and individu- als interested in the development of transportation. www.TRB.org www.national-academies.org

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COOPERATIVE RESEARCH PROGRAMS CRP STAFF FOR NCHRP REPORT 683 Christopher W. Jenks, Director, Cooperative Research Programs Crawford F. Jencks, Deputy Director, Cooperative Research Programs David B. Beal, Senior Program Officer (Retired) Waseem Dekelbab, Senior Program Officer Danna Powell, Senior Program Assistant Eileen P. Delaney, Director of Publications Hilary Freer, Senior Editor NCHRP PROJECT 12-76(01) PANEL Field of Design--Area of Bridges Jimmy D. Camp, New Mexico DOT, Santa Fe, NM (Chair) Susan E. Hida, California DOT, Sacramento, CA Ralph A. Gillmann, Federal Highway Administration, Washington DC Mayrai Gindy, University of Rhode Island, Kingston, RI David L. Huft, South Dakota DOT, Pierre, SD Terry D. Leatherwood, Tennessee DOT, Nashville, TN Wm. Travis McDaniel, Wisconsin DOT, Madison WI Mohsen Shahawy, SDR Engineering Consultants, Inc., Tallahassee, FL Firas I. Sheikh Ibrahim, FHWA Liaison Stephen F. Maher, TRB Liaison AUTHOR ACKNOWLEDGMENTS The research reported herein was performed under NCHRP Project 12-76 by Lichtenstein Consulting Engineers, Inc., Paramus, NJ, (now part of TranSystems Corporation, headquartered in Kansas City, MO) with subcontracting and consulting services provided by Michel Ghosn and Fred Moses. Additional stud- ies on truck sorting strategies were performed under NCHRP 12-76(01) by HNTB Corp. The principal investigator (PI) on this project was Bala Sivakumar, formerly of Lichtenstein Consulting Engineers, Inc, now with HNTB Corp. The calibration methodology, statistical analysis, and error filtration methodology were authored by Michel Ghosn with assistance from Fred Moses.

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FOREWORD By Waseem Dekelbab Staff Officer Transportation Research Board This report provides a set of protocols and methodologies for using available recent truck traffic data to develop and calibrate vehicular loads for LRFD superstructure design, fatigue design, deck design, and design for overload permits. The protocols are geared to address the collection, processing, and use of national weigh-in-motion (WIM) data. The report also gives practical examples of implementing these protocols with recent national WIM data drawn from states/sites around the country with different traffic exposures, load spec- tra, and truck configurations. The material in this report will be of immediate interest to bridge engineers. This report replaces NCHRP Web-Only Document 135. A new vehicular live-load model was developed for the AASHTO LRFD Bridge Design Specifications because the HS20 truck from AASHTO's Standard Specifications for High- way Bridges did not accurately represent service-level truck traffic. The HL93, a combina- tion of the HS20 truck and lane loads, was developed using 1975 truck data from the Ontario Ministry of Transportation to project a 75-year live-load occurrence. Because truck traffic volume and weight have increased and truck configurations have become more com- plex, the Ontario data do not represent present traffic loadings. Other design live loads were based on past practice and did not consider actual or projected truck traffic. Although the quality and quantity of traffic data have improved in recent years, this information has not been used to update the bridge design loads. Methods of using enhanced traffic data for bridge design needed to be developed. Under NCHRP Project 12-76 the research team had developed and demonstrated the application of protocols for collecting and processing traffic data to calibrate national bridge live-load models. Additionally, under NCHRP 12-76(01) the research team conducted sensitivity studies and developed key recommendations on sorting of trucks into Strength I and Strength II limit states. Appendices A through F from the research agency's final report are not published herein but are available on the TRB website (Go to http://trb.org/Publications/Public/PubsNCHRP ProjectReports.aspx and look for NCHRP Report 683). These appendices are titled as follows. Appendix A--Survey Questionnaires & Responses Appendix B--Main Features of Selected Studies Appendix C--National WIM Data Analyses Appendix D--Potential Processes to Develop and Calibrate Vehicular Design Loads Appendix E--Implementation of WIM Error Filtering Algorithm Appendix F--Truck Sorting Strategies & Influence on "r" Values

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CONTENTS 1 Summary 5 Chapter 1 Background 5 Problem Statement and Research Objective 5 Scope of Study 7 Introduction 8 Chapter 2 Research Approach 8 Research Tasks 8 Overview of Data Collection and Review 9 State-of-the-Practice Summary 21 Proposed Process to Develop Vehicular Live-Load Models 26 Chapter 3 Findings and Applications 26 Background to Development of Draft Recommended Protocols 30 Draft Recommended Protocols for Using Traffic Data in Bridge Design 59 Demonstration of Recommended Protocols Using National WIM Data 88 Additional Studies on Truck Sorting Strategies 103 Findings and Recommendations 106 Chapter 4 Conclusions and Suggested Research 106 Conclusions 107 Draft Recommended Protocols for Using Traffic Data in Bridge Design 110 Demonstration of Protocols Using National WIM Data 111 Recommendations for Sorting Traffic in the WIM Database into Strength I and Strength II 111 Suggested Research and Improvements in Data Collection 113 Bibliography and References 116 Appendices Note: Many of the photographs, figures, and tables in this report have been converted from color to grayscale for printing. The electronic version of the report (posted on the Web at www.trb.org) retains the color versions.