Traffic signals
Subtitle: 5 reports
By: prepared for the 52nd annual meeting.
Contributors: National Research Council (U.S.). Highway Research Board.
Series: Highway research record; no. 445
Publisher: Highway Research Board, National Research Council
Published: 1973
Place of publication: Washington
Language: eng
Number of pages: 47
Subjects: Traffic signs and signals.; Electronic traffic controls.
Notes: Includes bibliographical references.