Ziwei Yang

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Flexible pavement PSI can be obtained by the equation (1): Rigid pavement PSI can be obtained by the equation (2):
1. Since PSI is based on the AASHO Test data about 50 years ago, and the vehicles, road characteristics and traffic speeds have been improved a lot, the applicability is questionable. 2. PSI includes not only the rideability but also the surface defects. For the management of pavement inventory, it would be better to have separate measures of ride quality and surface defects. 3. People use more advanced instruments to measure roughness, but the PSI equations are based on the profilometer which is no longer used today, thus, there must be some errors using PSI equations.
Page 1 and 2: Ziwei Yang TTE 5837 Pavement Manage
Page 3 and 4: Rideability Maintenance costs Veh
Page 5: PSI is the foundation of pavement m
Page 9 and 10: IRI Roughness Scale
Page 11 and 12: Disadvantage: Measurement of IRI h
Page 13 and 14: Profile Dipstick A handle is mounte
Page 15 and 16: Profilographs: Widely used for rig
Page 17: Inertial Profilometers The princip

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