Pavement markings are often supplemented with raised retroreflective pavement markers (RRPMs) to provide increased visibility, especially in wet nighttime conditions. To provide adequate visibility, highway agencies need to replace their markings and markers before they reach inadequate levels of performance. Currently, there are no quantitative visibility performance requirements for in-service RRPMs. Most markers are replaced on the basis of visual inspection or predetermined replacement schedules. This paper presents an initial investigation into the impacts of different measurement systems and different geometries on the quantitative evaluation of the visibility of RRPMs. A key question was how the different measurement geometries affected the retroreflective performance of RRPMs. The research found that when the observation angle was held at 0.2° and the entrance angle increased, the coefficient of luminous intensity also increased. This finding was true for every color and brand of marker for the geometries tested. There was a notable drop in performance when the evaluation geometry was changed from pavement marker geometry to pavement marking geometry. When the photometric range was used, the pavement marking geometry resulted in data that were 7.8% of the values from the standard marker geometry. Charge-coupled device photometer measurements resulted in pavement marking geometry results that were on average 6.7% of the value of the RRPM geometry. These values being close indicated that the two measurement types were comparable and that the markers could consistently be evaluated at the two distinct geometries.


    Access

    Download

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Laboratory-Based Retroreflectivity Assessment of Raised Retroreflective Pavement Markers


    Additional title:

    Transportation Research Record


    Contributors:


    Publication date :

    2017-01-01




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





    Red Retroreflective Raised Pavement Markings

    Miles, Jeffrey D. / Carlson, Paul J. / Ullman, Brooke et al. | Transportation Research Record | 2008


    Raised Pavement Marker Assessments Using Mobile Retroreflectivity Unit Technology

    Oracheff, Alexander / Shahin, Ali / Holzschuher, Charles et al. | Transportation Research Record | 2022