Cover image for Changeable message signs.
Title:
Changeable message signs.
Author:
National Research Council (U.S.). Transportation Research Board.
Publication Information:
Washington : Transportation Research Board, National Research Council, 1979.
Physical Description:
37 pages : illustrations ; 28 cm.
General Note:
"Research sponsored by the American Association of State Highway and Transportation Officials in cooperation with the Federal Highway Administration."
Language:
English
ISBN:
9780309029162
Format :
Book