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Title:

ESTABLISHING A MINIMUM FUNCTIONAL REFLECTANCE FOR RAISED PAVEMENT MARKERS

Accession Number:

00476067

Record Type:

Component

Availability:

Find a library where document is available


Order URL: http://worldcat.org/isbn/0309046599

Abstract:

In this paper, the causes of reduction in reflectivity of reflective raised pavement marker (RPM) and reflective raised traffic button (RTB) systems, and a procedure to evaluate the effectiveness of these two types of marker systems, are discussed. All marker systems lose 95 percent of their reflectivity in the first 6 months after installation. Approximately one-half (50 percent) of their initial brightness is lost in the first 25,000 impacts and an additional 20 percent in the next 175,000 impacts. The major cause of loss of reflectivity in RPMs is the actual loss of the marker because of improper installation and the nature of the road surface on which the marker is placed. (Asphalt surfaces result in a greater loss of markers than portland cement concrete surfaces.) Those markers that remain on the roadway lose reflectivity because of abrasion and moisture seeping between the lens and the reflector. The major problem of ceramic markers is loss of reflectivity. Ceramic button markers generally are not dislodged from the pavement surface because of their shape. The major losses of reflectivity for ceramic marker systems result from the loss of reflector units and dirt accumulation on the reflectors. A method for the maintenance of marker systems is presented that uses reflectivity and loss of markers as evaluating criteria. The procedure and criteria are applicable both to centerlines and lane lines.

Supplemental Notes:

Publication of this paper sponsored by Committee on Visibility. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

Monograph Accession #:

00623530

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

McNees, Roger W

Pagination:

pp 66-72

Publication Date:

1987

Serial:

Transportation Research Record

Issue Number: 1149
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0-309-04659-9

Media Type:

Print

Features:

Figures (6) ; Photos (3) ; References (2) ; Tables (5)

Uncontrolled Terms:

Causes; Dirt

Old TRIS Terms:

Subject Areas:

Construction; Geotechnology; Highways; Maintenance and Preservation; Operations and Traffic Management; Safety and Human Factors; I73: Traffic Control

Files:

TRIS, TRB

Created Date:

Sep 30 1988 12:00AM

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