The present serviceability index (PSI) is a pavement performance measure. Introduced by the American Association of State Highway and Transportation Officials (AASHTO), the PSI is one of the most widely used pavement performance indicators after pavement condition index (PCI) and international roughness index (IRI).[1][2] This performance indicator ranges between 0 and 5, 0 representing a failed pavement and 5 an excellent one. Since the PSI entails slope variance, it is correlated with performance indicators related to roughness such as IRI.[3]
^Piryonesi, S. M.; El-Diraby, T. E. (2020) [Published online December 21, 2019]. "Data Analytics in Asset Management: Cost-Effective Prediction of the Pavement Condition Index". Journal of Infrastructure Systems. 26 (1): 04019036. doi:10.1061/(ASCE)IS.1943-555X.0000512. S2CID 213782055.
^Piryonesi, S. M. (2019). The Application of Data Analytics to Asset Management: Deterioration and Climate Change Adaptation in Ontario Roads (Doctoral dissertation). University of Toronto.
^Hall, Kathleen; Muñoz, Carlos (1999-01-01). "Estimation of Present Serviceability Index from International Roughness Index". Transportation Research Record. 1655: 93–99. doi:10.3141/1655-13. S2CID 108511635.
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