or more over a distance equal to at least one-half the crack length. A Class 3 crack is defined as opened or spalled (at the surface) to a width of 0.25 in. Calculated value to match PSR SV = mean of the slope variance in the two wheelpaths (measured with the CHLOE profilometer or BPR Roughometer) C, P = measures of cracking and patching in the pavement surface C = total linear feet of Class 3 and Class 4 cracks per 1000 ft2 of pavement area.Present Serviceability Rating (PSR) Picture from: Highway Research Board Special Report 61A-GįYI – NOT TESTABLE Present Serviceability Index (PSI) Result is usually a numerical scale From the AASHO Road Test (1956 – 1961).Develop methods to relate physical attributes to driver ratings. ![]() ![]() ![]() Pavement Condition From WSDOT I – 90 “fat driver” syndrome $20 to $30 billion spent annually on pavements.Drainage DC to Richmond Road in 1919 – from the Asphalt Institute.
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