The purpose of this study was to evaluate the operational applicability of raised pavement markers and to determine their effectiveness with respect to brightness and durability. Seven different types of markers were evaluated. The primary application of markers in this study was as a supplement to lane lines. They were also used as a traffic control measure at lane drops, as delineation for hazardous curves, and as directional arrows.

Luminosity and durability were monitored for approximately one year. It was found that raised pavement markers can be a very effective method of roadway delineation. Markers evaluated had varying levels of brightness and durability. Costs varied considerably among types.

Specifications, which classified and described the markers, were proposed. Details for the recommended design layout of markers as supplements to and replacements for lane lines were proposed.

Report Date


Report Number

No. 425

Digital Object Identifier



The contents of this report reflect the views of the authors who are responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or Policies of the Bureau of Highways. This report does not constitute a standard, specification, or regulation.