Q$\mathrm{.}6$: A six$-$lane divided highway $($three lanes in each direction$)$ is on rolling terrain with $1\mathrm{.}2$ Access points

per $km$ and has $3m$ lanes, with a $1\mathrm{.}5m$ shoulder on the right side and a $0\mathrm{.}9m$ shoulder on the left side. The

peak hour factor is $0\mathrm{.}80,$ and the directional peak$-$hour volume is $3000$ vehicles per hour. There are $6\%$ large

trucks, $2\%$ buses, and $2\%$ recreational vehicles. A significant percentage of non$-$familiar roadway users are

in the traffic stream $($the driver population adjustment factor is estimated as $0\mathrm{.}95).$ The posted speed limit is

$90k\frac{m}{h}.$ A local manufacturer wishes to open a factory near the section of the highway. How many large

trucks can be added to the peak hour directional volume before capacity is reached? $($Assume PHF constant$)$