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    Development and Evaluation of the Ride Number Concept

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    The statistical analysis of pavement ride quality was introduced in the United States during the 1950s at the AASHO Road Test. It was at the Road Test that Carey and Irick developed the statistical relationship between pavement surface profile and measured subjective ride quality. Interest in pavement ride quality continued in the 1960s with the development of the road meter and the inertial profilometer, which for the first time provided a fast and accurate method for measuring and recording pavement surface profile in a computer-readable format.

    During the 1970s, ride quality transforms relating pavement surface profile measurements made with the inertial profilometer to measured subjective ride quality were developed at the University of Texas and at the Michigan Department of Transportation. During the 1980s, the ride number concept for estimating pavement ride quality from surface profile measurements was developed by Janoff et al. in a National Cooperative Highway research project. This paper discusses the further development of the ride number transform, its evaluation in the NCHRP and Ohio DOT research projects, and the comparison of its performance to other candidate measures of pavement ride quality including the Texas Serviceability Index, the Michigan Ride Quality Index, the Mays Road Meter Index, and the International Roughness Index.


    ride number, pavement ride quality, pavement roughness, inertial profilometer, International Roughness Index, Mays Road Meter Index, Texas Serviceability Index, Michigan Ride Quality Index

    Author Information:

    Spangler, EB
    Surface Dynamics, Inc., Bloomfield Hills, MI

    Kelly, WJ
    Surface Dynamics, Inc., Bloomfield Hills, MI

    Committee/Subcommittee: E17.33

    DOI: 10.1520/STP13253S