Effectiveness of changeable message displays in advance of high-speed freeway land closures
By: Fred R. Hanscom.
Contributors: National Research Council (U.S.). Transportation Research Board.; American Association of State Highway and Transportation Officials.; United States. Federal Highway Administration.
Series: National Cooperative Highway Research Program -- 235
Publisher: Transportation Research Board, National Research Council
Published: 1981
Place of publication: Washington, D.C
Language: eng
Number of pages: 49
Subjects: Traffic signs and signals.; Traffic safety.
Notes: "Sponsored by the American Association of State Highway and Transportation Officials in cooperation with the Federal Highway Administration."

Project 3-21(2) '77.

Includes bibliographical references.