Description
Item Description:"Research study number 2-18-84-331."
"TTI-2-18-84-331-3F"--Cover.
"May 1986."
Sponsored by Texas State Department of Highways and Public Transportation, in cooperation with U.S. Department of Transportation, Federal Highway Administration.
Physical Description:vii, 156 pages : illustrations ; 28 cm.
Bibliography:Bibliography: pages 55-56.