Traffic and grade crossing control devices.
Contributors: National Research Council (U.S.). Transportation Research Board. Meeting
Series: Transportation research record,; 1244
Publisher: Transportation Research Board, National Research Council
Published: 1989
Place of publication: Washington, D.C
Language: eng
Number of pages: 72
Subjects: Traffic signs and signals.; Railroads -- Crossings.
Notes: Includes bibliographical references.
Papers from the 68th Annual Meeting of the Transportation Research Board, Jan. 22-26, 1989, Washington, D.C.