A multilane highway $($two lanes in each direction$)$ is on level terrain. The free$-$flow speed has been measured at $45$ mi$/$h$.$ The peak$-$hour directional traffic flow is $1300$ vehicles with $6\%$ large trucks and buses and $2\%$ recreational vehicles $($fp $=0\mathrm{.}95).$ If the peak$-$hour factor is $0\mathrm{.}85,$ determine the highway$$s level of service