$(2)$ A $4-$mi undivided $4-$lane highway is located on level terrain. A $6,600ft$ segment with $1\mathrm{.}5\%$ grade is included in the study.

Determine the peak hour LOS for the upgrade portion of the highwary given the following

$46\mathrm{.}0m\frac{i}{h}$ field$-$measured FFS

II ft lane width

$1,900$ veh$/$h peak$-$hour volume in one direction

$.7\%$ trukts; $1\%$ buses; and $2\%R{V}_s$

$PHF=0\mathrm{.}90$