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Nchrp Synthesis 321 NATIONAL COOPERATIVE HIGHWAY RESEARCH NCHRP PROGRAM SYNTHESIS 321 Roadway Safety Tools for Local Agencies A Synthesis of Highway Practice TRANSPORTATION RESEARCH BOARD EXECUTIVE COMMITTEE 2003 (Membership as of August 2003) Officers ! " ! # Members $!$ ! %&'( ! ! ) * +, ++ !( - * % . /) - (! / %/ ( . ( ++ " )! #( 0! ) , . /+ ! %& ! . * ! ! ! ! ! %& ! * , ++ " %&( , 1 .& . * ! " % ( / * ! #( & $* +( 2 ++! ! " ++! ! " ! * . ! " #$ %&'(%)#" ++ . ! " 2 ! ++! ! " '* )$+" ++ ! " 2 % ! " ! " $ & ! ! " ! ++! ! " ! % ! " ! ++ ! " # ! ++! ! " /! ! " 2 & ++! ! " , , ! ++ ! " % & ! ++! ! " 2 ++! ! " 2 ) ++! ! " %-'% *" ) ++! ! " NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM ! # $/ % & .% )" ! !( - 2 & " ! # ! " 2 3 3 4506 ! .% )" 2 & ) % !$ ! - ( 2 & 2 ! ! /, %&)$! %&'( ! #(78 * + ! # % &*" ) , 2 & % &*" ! # % 34506 * ) NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM NCHRP SYNTHESIS 321 Roadway Safety Tools for Local Agencies A Synthesis of Highway Practice CONSULTANT EUGENE M. WILSON, P.E., Ph.D., PTOE Transportation Engineering Safety Consultant Laramie, Wyoming TOPIC PANEL DONALD J. GALLOWAY, Sarasota County Traffic Engineering and Operations ANTHONY R. GIANCOLA, National Association of County Engineers JOHN N. IVAN, Connecticut Transportation Institute JOSEPH J. LASEK, Columbia, Maryland RICHARD F. PAIN, Transportation Research Board STANLEY POLANIS, City of Winston–Salem Department of Transportation BRAD SANT, American Road & Transportation Builders Association A.D. WYATT, North Carolina Department of Transportation KATHY HOFFMAN, Federal Highway Administration (Liaison) JOHN MCFADDEN, Federal Highway Administration (Liaison) SUBJECT AREAS Highway Operations, Capacity, and Traffic Control, and Safety and Human Performance 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. 2003 www.TRB.org NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM NCHRP SYNTHESIS 321 Systematic, well-designed research provides the most effective Project 20-5 FY 2001 (Topic 33-06) approach to the solution of many problems facing highway ad- ISSN 0547-5570 ministrators and engineers. Often, highway problems are of local ISBN 0-309-06968-8 interest and can best be studied by highway departments individu- Library of Congress Control No. 2003108646 ally or in cooperation with their state universities and others. How- ever, the accelerating growth of highway transportation develops © 2003 Transportation Research Board increasingly complex problems of wide interest to highway au- thorities. These problems are best studied through a coordinated Price $20.00 program of cooperative research. In recognition of these needs, the highway administrators of the American Association of State Highway and Transportation Officials initiated in 1962 an objective national highway research NOTICE program employing modern scientific techniques. This program The project that is the subject of this report was a part of the National Co- is supported on a continuing basis by funds from participating operative Highway Research Program conducted by the Transportation member states of the Association and it receives the full coopera- Research Board with the approval of the Governing Board of the Na- tion and support of the Federal Highway Administration, United tional Research Council. Such approval reflects the Governing Board’s judg- States Department of Transportation. ment that the program concerned is of national importance and appropriate The Transportation Research Board of the National Research with respect to both the purposes and resources of the National Research Council. Council was requested by the Association to administer the re- The members of the technical committee selected to monitor this pro- search program because of the Board’s recognized objectivity and ject and to review this report were chosen for recognized scholarly com- understanding of modern research practices. The Board is petence and with due consideration for the balance of disciplines appro- uniquely suited for this purpose as it maintains an extensive priate to the project. The opinions and conclusions expressed or implied are those of the research agency that performed the research, and, while committee structure from which authorities on any highway they have been accepted as appropriate by the technical committee, they transportation subject may be drawn; it possesses avenues of are not necessarily those of the Transportation Research Board, the Na- communication and cooperation with federal, state, and local tional Research Council, the American Association of State Highway and governmental agencies, universities, and industry; its relationship Transportation Officials, or the Federal Highway Administration of the U.S. Department of Transportation. to the National Research Council is an insurance of objectivity; it Each report is reviewed and accepted for publication by the technical maintains a full-time research correlation staff of specialists in committee according to procedures established and monitored by the highway transportation matters to bring the findings of research Transportation Research Board Executive Committee and the Governing directly to those who are in a position to use them. Board of the National Research Council. The program is developed on the basis of research needs iden- tified by chief administrators of the highway and transportation departments and by committees of AASHTO. Each year, specific areas of research needs to be included in the program are proposed to the National Research Council and the Board by the American Association of State Highway and Transportation Officials. Re- search 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, Published reports of the however, is intended to complement rather than to substitute for or duplicate other highway research programs. NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM are available from: Transportation Research Board Business Office 500 Fifth Street Washington, D.C. 20001 NOTE: The Transportation Research Board of the National Academies, the Na- and can be ordered through the Internet at: tional Research Council, the Federal Highway Administration, the American As- sociation of State Highway and Transportation Officials, and the individual states http://www.national-academies.org/trb/bookstore participating in the National Cooperative 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 this report. Printed in the United States of America 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. Upon 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. Bruce M. Alberts 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. Wm. A. Wulf 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,
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