Select the correct option with regard to the following statements (S1, S2) pertaining to pavements.
S1: Present serviceability index is used for the functional evaluation of pavement surface condition.
S2: Rigid pavements are less affected by temperature variations than flexible pavements.
Present serviceability index defines pavement performance in terms of the present serviceability index (PSI), which varies from 0 to 5 Where 5 represent excellent.
Rigid pavements are made up of Portland cement concrete, and may or may not have a base course between the pavement and the subgrade.
The difference between rigid and flexible pavement is given by: