Study of the national standards for directional and other official signs, laboratory evaluation
By: Alfred G. Klipple and King M. Roberts.
Contributors: Roberts, King M.; United States. Federal Highway Administration. Office of Research.; United States. Federal Highway Administration.
Series: Report - Federal Highway Administration ; no. FHWA-RD-75-117
Publisher: Dept. of Transporation, Federal Highway Administration, Office of Research and Development; for sale by the National Teachical Information Service
Published: 1975
Place of publication: Washington; Springfield, Va
Language: eng
Number of pages: 31
Subjects: Traffic signs and signals -- Standards -- United States.
Notes: Cover title.

Final report issued Oct. 1975.