Q $3.$

$(10$ Points$)$

An urban freeway presently has three $12-$ft lanes in each direction and is located on a

rolling terrain. The traffic includes $8$ percent trucks and buses $($Recreational vehicles are

negligible$).$ There are no lateral obstructions and interchanges are spaced $0\mathrm{.}8-$mile apart.

The Peak Hourly Factor is $0\mathrm{.}90.$

$($a$)$ What maximum hourly volume can currently be accommodated at capacity?

$($b$)$ How much could the maximum hourly volume be increased by widening and

remarking the existing roadway to provide four $10-ft$ lanes?