$6\mathrm{.}9$ An eight$-$lane freeway $($four lanes in each direction$)$ is on rolling terrain and has $11-$ft lanes with a $4-$ft right$-$side shoulder. The total ramp density is $1\mathrm{.}5$ ramps per mile. The directional peakhour traffic volume is $5400$ vehicles with $11\%$ heavy vehicles. The peak$-$hour factor is $0\mathrm{.}95.$ It has been decided that heavy vehicles will be banned from the freeway during the peak hour. What will the freeway's density and LOS be before and after the ban? $($Assume that the heavy vehicles are removed and all other traffic attributes are unchanged.$)$