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Po : initial serviceability index, Pt : terminal serviceability index ,PSI: present serviceability index ,PSI = Po - Pt
PSI is a mathmatical measurement for The PSR (Present serviceability rating) , it's related to the riding quality and Po value is taken immediately after the construction of the pavemnet, / usually a value of4.5 is taken for Po and (2-2.5) for Pt on major highways
PO is Initial serviceability index.
PO is considered to be the a present serviceability index (PSI) immediately after the pavement is open.
Its mean that the Initial serviceability index (Po) – Po is considered to be that PSI immediately after the pavement is open. AASHTO values are4.5 for rigid pavement and4.2 for flexible pavement.
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