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Proposed Chapters for Incorporating Travel Time Reliability into the Highway Capacity Manual (2013)

Chapter: 2013.09.11 Foreword for L08 Proposed HCM Chaps 36 37 Final Comp.docx

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Suggested Citation:"2013.09.11 Foreword for L08 Proposed HCM Chaps 36 37 Final Comp.docx." National Academies of Sciences, Engineering, and Medicine. 2013. Proposed Chapters for Incorporating Travel Time Reliability into the Highway Capacity Manual. Washington, DC: The National Academies Press. doi: 10.17226/22486.
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Suggested Citation:"2013.09.11 Foreword for L08 Proposed HCM Chaps 36 37 Final Comp.docx." National Academies of Sciences, Engineering, and Medicine. 2013. Proposed Chapters for Incorporating Travel Time Reliability into the Highway Capacity Manual. Washington, DC: The National Academies Press. doi: 10.17226/22486.
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Suggested Citation:"2013.09.11 Foreword for L08 Proposed HCM Chaps 36 37 Final Comp.docx." National Academies of Sciences, Engineering, and Medicine. 2013. Proposed Chapters for Incorporating Travel Time Reliability into the Highway Capacity Manual. Washington, DC: The National Academies Press. doi: 10.17226/22486.
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Suggested Citation:"2013.09.11 Foreword for L08 Proposed HCM Chaps 36 37 Final Comp.docx." National Academies of Sciences, Engineering, and Medicine. 2013. Proposed Chapters for Incorporating Travel Time Reliability into the Highway Capacity Manual. Washington, DC: The National Academies Press. doi: 10.17226/22486.
×
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Suggested Citation:"2013.09.11 Foreword for L08 Proposed HCM Chaps 36 37 Final Comp.docx." National Academies of Sciences, Engineering, and Medicine. 2013. Proposed Chapters for Incorporating Travel Time Reliability into the Highway Capacity Manual. Washington, DC: The National Academies Press. doi: 10.17226/22486.
×
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Suggested Citation:"2013.09.11 Foreword for L08 Proposed HCM Chaps 36 37 Final Comp.docx." National Academies of Sciences, Engineering, and Medicine. 2013. Proposed Chapters for Incorporating Travel Time Reliability into the Highway Capacity Manual. Washington, DC: The National Academies Press. doi: 10.17226/22486.
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SHRP 2 Reliability Project L08 Proposed Chapters for Incorporating Travel Time Reliability into the Highway Capacity Manual

SHRP 2 Reliability Project L08 Proposed Chapters for Incorporating Travel Time Reliability into the Highway Capacity Manual Paul Ryus, James Bonneson, Richard Dowling, John Zegeer, Mark Vandehey, and Wayne Kittelson Kittelson & Associates, Inc. Nagui Rouphail, Bastian Schroeder, Ali Hajbabaie, Behzad Aghdashi, Thomas Chase, and Soheil Sajjadi Institute for Transportation Research and Education at North Carolina State University Richard Margiotta Cambridge Systematics TRANSPORTATION RESEARCH BOARD Washington, D.C. 2013 www.TRB.org

© 2013 National Academy of Sciences. All rights reserved. ACKNOWLEDGMENT This work was sponsored by the Federal Highway Administration in cooperation with the American Association of State Highway and Transportation Officials. It was conducted in the second Strategic Highway Research Program, which is administered by the Transportation Research Board of the National Academies. COPYRIGHT INFORMATION Authors herein are responsible for the authenticity of their materials and for obtaining written permissions from publishers or persons who own the copyright to any previously published or copyrighted material used herein. The second Strategic Highway Research Program grants permission to reproduce material in this 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, or FHWA endorsement of a particular product, method, or practice. It is expected that those reproducing material in this document for educational and not-for-profit purposes will give appropriate acknowledgment of the source of any reprinted or reproduced material. For other uses of the material, request permission from SHRP 2. NOTICE The project that is the subject of this document was a part of the second Strategic Highway Research Program, conducted by the Transportation Research Board with the approval of the Governing Board of the National Research Council. The Transportation Research Board of the National Academies, the National Research Council, and the sponsors of the second Strategic Highway Research Program do not endorse products or manufacturers. Trade or manufacturers’ names appear herein solely because they are considered essential to the object of the report. DISCLAIMER The opinions and conclusions expressed or implied in this document are those of the researchers who performed the research. They are not necessarily those of the second Strategic Highway Research Program, the Transportation Research Board, the National Research Council, or the program sponsors. The information contained in this document was taken directly from the submission of the authors. This material has not been edited by the Transportation Research Board.

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 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, upon 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 Transportation 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 individuals interested in the development of transportation. www.TRB.org www.national-academies.org

Foreword William Hyman, SHRP 2 Senior Program Officer, Reliability This document contains two proposed chapters for the Transportation Research Board’s Highway Capacity Manual (HCM) that introduce the concept of travel time reliability and offer new analytic methods. The chapters were prepared under SHRP 2 Project L08, Incorporation of Travel Time Reliability into the Highway Capacity Manual, but they have not been officially accepted by the Highway Capacity and Quality of Service (HCQS) Committee of the Transportation Research Board. The HCQS Committee has responsibility for approving the content of the HCM. The scope of work for SHRP 2 Reliability Project L08 called for revising the methodologies for freeway facilities and urban streets. This research has resulted in a prospective Chapter 36 for the HCM concerning freeway facilities and urban streets and a prospective supplemental Chapter 37 that elaborates on the methodologies and provides an example calculation. In addition, a report documenting the research effort was prepared. It includes the user’s guides for the computational engines for freeways and urban streets. As with all SHRP 2 research, it is standard procedure to publish the key documents that result from each research project. The National Academies have approved Chapters 36 and 37 and the final report for publication as SHRP 2 products. The HCQS Committee, responsible for approval of changes to the HCM, has begun considering this material. Proposed Chapters 36 and 37 set out methodologies for incorporating reliability into the HCM analytic procedures for freeway facilities and urban streets. The approach is to generate many freeway and urban street scenarios involving various causes of nonrecurring congestion, such as incidents, weather, and work zones, and use the scenarios as input to a computational engine to calculate travel time

over a segment. The travel times for each scenario are used to construct a distribution of travel time from which reliability performance measures can be derived. Chapter 37 supplements Chapter 36. It provides reliability values for selected U.S. facilities, offers an alternative freeway incident prediction method, elaborates on the freeway and urban street scenario generators, explains how to measure reliability in the field, and gives an example problem.

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TRB’s second Strategic Highway Research Program (SHRP 2) Reliability Project L08 has released two proposed chapters, numbers 36 and 37, for TRB’s Highway Capacity Manual 2010 (HCM2010) that introduce the concept of travel time reliability and offer new analytic methods.

The prospective Chapter 36 for the HCM2010 concerns freeway facilities and urban streets and the prospective supplemental Chapter 37 elaborates on the methodologies and provides an example calculation. The chapters are proposed; they have not yet been accepted by TRB's Highway Capacity and Quality of Service (HCQS) Committee. The HCQS Committee has responsibility for approving the content of the HCM2010.

SHRP 2 Reliability project L08 has also released a report titled Incorporation of Travel Time Reliability into the HCM that presents a summary of the work conducted during the course of developing the proposed chapters.

In addition, SHRP 2 Reliability project L08 has also released the FREEVAL and STREETVAL Computational Engines. The FREEVAL-RL computational engine employs a scenario generator that feeds the Freeway Highway Capacity Analysis methodology in order to generate a travel time distribution from which reliability metrics can be derived. The STREETVAL-RL computational engine employs a scenario generator that feeds the Urban Streets Highway Capacity Analysis methodology in order to generate a travel time distribution from which reliability metrics can be derived.

Software Disclaimer - This software is offered as is, without warranty or promise of support of any kind either expressed or implied. Under no circumstance will the National Academy of Sciences or the Transportation Research Board (collectively "TRB") be liable for any loss or damage caused by the installation or operation of this product. TRB makes no representation or warranty of any kind, expressed or implied, in fact or in law, including without limitation, the warranty of merchantability or the warranty of fitness for a particular purpose, and shall not in any case be liable for any consequential or special damages.

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