Grade crossings, devices, visibility, and freeway operations
By: Transportation Research Board, Commission on Sociotechnical Systems, National Research Council.
Contributors: National Research Council (U.S.). Transportation Research Board.
Series: Transportation research record ;; 773
Publisher: National Academy of Sciences
Published: 1980
Place of publication: Washington, D.C
Language: eng
Number of pages: 49
Subjects: Traffic signs and signals.; Railroads -- Crossings.; Visibility.; Express highways.