Annual; Authors: Barbara M. Efird, Barbara S. Wiggins, 1999/2000-; Vols. for 2002/2003 issued in 2 parts: Agency and community college version and School version; vols. for 2003/2004- issued in 2 parts: Adult edition and Youth edition.
"April 29, 2009."; Includes bibliographical references (p. 73-75).; Final report;; Performed by Department of Civil and Environmental Engineering, University of North Carolina at Charlotte, sponsored by NC Department of Transportation, Research Unit