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Edition:Final report; 2002-2009.
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Abstract:This report presents the findings associated with the development of a new pavement roughness index
called the Posted Speed Localized Roughness Index (LRIPS) that can be used to rate the ride quality on
bridge approach slabs. Currently established pavement roughness indices, such as ride number (RN),
profile index (PI) and international roughness index (IRI) cannot effectively rate approach slabs due to
inherent limitations. This study was initiated in support of a Louisiana Quality Initiative (LQI) research
effort entitled “Preservation of Bridge Approach Rideability,” which sought to investigate methods of
improving ride quality on bridge approach slabs [18]. The LRIPS is derived using the accelerometer
outputs which high-speed profilers provide. Based on the data collected through this research, vehicle
travel can be considered comfortable if the LRIPS is smaller than 1.2; uncomfortable if it is between 1.2
and 6.0; tolerable if between 6.0 and 30; intolerable if between 30 and 150 and unsafe if greater than
150.
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