estimate the equivalent 18-kip single-axle load applications (esal) for a four-lane pave- ment (two lanes in each direction) of a rural interstate highway with a truck count of 100 0 per day (including 2-axle, 4-tire panel, and pickup trucks), an annual growth rate of 5% , and a design life of 20 years. [answer: 2.82 x 106]