Traffic Load:

The Annual Average Daily Traffic $($AADT$)$ count conducted on only one direction of a $3-$lane $($in

each direction$)$ urban interstate highway is $20000$ vehicles of which $10\%$ is truck traffic. $50\%$ of

the truck traffic is single unit trucks with an estimated truck factor of $0\mathrm{.}4$ ESALs per truck, $45\%$

of the truck traffic is double units with an estimated truck factor of $1\mathrm{.}1$ ESALs per truck, while

the remaining trucks are truck trains $($trucks with more than $2$ units$)$ with estimated $1\mathrm{.}5$ ESALs

per truck. Given a $2\%$ growth rate $(r)$ of all vehicles, and assuming a terminal serviceability limit

$($pt$)$ of $2\mathrm{.}5$ and structural number $($SN$)$ of $5,$ determine the design ESALs for a $20$ design period

$($n$)$ for the road for the design lane.

Graduations of Aadreaate Stockpiles