Example:

A low volume highway is to be designed on a subgrade with a $CBR=4.$ The service period is $10$ years, and a traffic count estimates $500$ ESALs$/$year$.$ Assuming no growth in traffic, design a flexible pavement using $CB{R}_{\text{b}\text{a}\text{s}\text{e}}=80$ and $CB{R}_{\text{s}\text{u}\text{b}\text{b}\text{a}\text{s}\text{e}}=20.$