Color coded interchange ramps.
Contributors: United States. Bureau of Public Roads.
Publisher: Oregon State Highway Dept., Traffic Engineering Division
Published: 1966
Place of publication: [Salem]
Language: eng
Number of pages: 44
Subjects: Traffic signs and signals -- Oregon.; Roads -- Oregon -- Interchanges and intersections.
Notes: Bibliographical footnotes.
Prepared in cooperation with the U.S. Dept. of Commerce, Bureau of Public Roads.