What is the Present Serviceability Index (PSI)?

The PSI is just a measure of the current overall rating of a section of highway based upon visual observation. The scale goes from 5 (perfect) to 0 (awful).  It is similar to the 100 point rating scale used in our CAMP-RS program.

Road crossing bridge with hill in the background

In pavement design, it is used to define the minimum acceptable level of quality. This terminal  PSI allows an agency to define what is the anticipated PSI when a road is rebuilt or rehabilitated. New York State Department of Transportation uses a terminal PSI of 2 for lower volume state highways.

References

Present Serviceability Index
pavement interactive

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This work by the Cornell Local Roads Program (CLRP) is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License.