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STATE OF THE ART REPORT 9 Utilities and Roadside Safety Committee on Utilities Transportation Research Board Washington, D.C. 2004 www.TRB.org
Transportation Research Board State of the Art Report 9 Transportation Research Board publications are available by ordering individual pub- lications directly from the TRB Business Ofï¬ce, through the Internet at www.TRB.org or national-academies.org/trb, or by annual subscription through organizational or individual affiliation with TRB. Affiliates and library subscribers are eligible for sub- stantial discounts. For further information, contact the Transportation Research Board Business Ofï¬ce, 500 Fifth Street, NW, Washington, DC 20001 (telephone 202-334-3213; fax 202-334-2519; or e-mail TRBsales@nas.edu). Copyright 2004 by the National Academy of Sciences. All rights reserved. Printed in the United States of America. ISBN 0-309-09451-8 TRB Technical Activities Division Design and Construction Group Gail C. Page, Florida Department of Transportation, Chair Design Section Barbara A. Petrarca, Rhode Island Department of Transportation, Chair Utilities Committee C. Paul Scott, TBE Group, Chair Transportation Research Board Staff Mark R. Norman, Director, Technical Activities Stephen F. Maher, Engineer of Design Javy Awan, Managing Editor Norman Solomon, Senior Editor Cay Butler, Editor Juanita Green, Production Manager