TRIS Online Record

Printable View

Title	RETROREFLECTIVE RAISED PAVEMENT MARKER FIELD TESTING: RESULTS OF THE FIRST YEAR EVALUATION. INTERIM REPORT
Accession No	00647322
Authors	Ullman, G L
Period Covered	9208-9312
Corp. Authors / Publisher	Texas Transportation Institute ; Texas Department of Transportation
Publication Date	19940100
Description	106 p.; Appendices(3); Figures; References(4); Tables
Languages	English
Abstract	This report documents the results of field testing of seventeen types of retroreflective raised pavement markers (RRPMs) installed in August 1992 at four interstate locations around San Antonio, Texas. Reflectivity measurements were taken periodically at each site using a portable reflectometer. These data were supplemented with laboratory reflectivity measurements from RRPMs taken from each site and sent to the TxDOT testing laboratory in Austin, Texas. Study results indicate that most of the RRPMs experienced significant losses in reflectivity over short periods of time. Under the range of traffic conditions examined, many RRPMs dropped below approximate minimum reflectivity thresholds after six months in the field. Initial losses in reflectivity were due primarily to dirt accumulation on the reflective lenses. Over time, abrasions and weathering caused reflectivity losses to become permanent. Three RRPM types that had thin glass layers epoxied over the reflective lenses were still providing significant levels of reflectivity after 54 weeks in the field at all of the test locations. For the other RRPMs, differences in reflectivity loss rates appeared to depend mostly upon the total traffic volumes passing next to the RRPMs at each test site, and less so upon the amount of truck traffic or lane-changing activity.
Supplemental Information	Research study title: Raised Pavement Marker Field Testing.
TRT Terms	Abrasions ; Field tests ; Losses ; Measurement ; Reflectivity ; Soils ; Traffic volume ; Weathering
Other Terms	Accumulation; Dirt; Glass covered lenses; Retroreflective raised traffic markers
Subject Areas	H54 OPERATIONS AND TRAFFIC CONTROL; I73 Traffic Control
Contract Number	Study 7-1946
Report Number	TX-93/1946-2; Res Rept 1946-2; TTI: 7-1946
Availability	National Technical Information Service
TRIS Files	HRIS
Database	TRIS Online

TRIS is a bibliographic database funded by sponsors of the Transportation Research Board (TRB), primarily the state departments of transportation and selected federal transportation agencies. TRIS Online is hosted by the National Transportation Library under a cooperative agreement between the Bureau of Transportation Statistics and TRB.