The Pavement Condition Index (PCI) is an example of an engineering approach applied to existing pavements. Another example is the use of a falling weight deflectometer (FWD) to non-destructively test existing pavements.
In the context of evaluating existing pavements, the Pavement Condition Index (PCI) serves as an engineering approach. Similarly, using a falling weight deflectometer (FWD) to conduct non-destructive tests on pavements illustrates another method for assessment.