$($b$)$ A rural motorway is designed with four lanes. Using the information below:

Two lanes per direction

$3\mathrm{.}3m$ lane width

$0\mathrm{.}6m$ lateral clearance

Commuter traffic

$2,000ve\frac{h}{h}$ peak hour volume per direction

$5\%$ trucks and buses

$0\mathrm{.}92$ peak hour factor $(PHF)$

$0\mathrm{.}6$ interchanges per kilometer

Rolling terrain

$($i$)$ Determine the level of service $($LOS$)$ of an existing rural four$-$lane

freeway.

$($ii$)$ Find the additional traffic to reach capacity.