Guardrail encroachment monitor, GEM
By: prepared for Federal Highway Administration, Offices of Research & Development, Structures and Applied Mechanics Division.
Contributors: United States. Federal Highway Administration. Structures and Applied Mechanics Division.; Southwest Research Institute.
Publisher: The Division; National Technical Information Service [distributor]
Published: 1981
Place of publication: Washington, D.C; Springfield, Va
Language: eng
Number of pages: 41
Subjects: Roads -- United States -- Guard fences.; Detectors.
Other titles: Guardrail enroachment monitor-G.E.M.
Notes: Cover title.

"Southwest Research Institute"--1st prelim. p.

"Summary report."

"May 1981."

Contract no.: DOT-FH-11-8498.

"Report no. FHWA/RD-80/174."