$2.$ Use HCS and do the following problem. Then do calculations manually to understand the steps. Compare the results. $(6$ points$)$

Assume PHF is $1\mathrm{.}0,$ the percentage of heavy vehicles in any flow is $20\backslash \%,$ and traffic is comprised of commuters. Interchange density is $2$ per mile. The measured free flow speed on freeway is $70$ mph and on the ramps is $50$ mph $.$

Traffic volumes are:

A$-$C $($Freeway to freeway$)$ volume $\backslash (=2600\backslash$mathrm$\{$vph$\}\backslash )$

A$-$D $($Freeway to ramp$)$ volume $\backslash (=600\backslash$mathrm$\{$vph$\}\backslash )$

B$-$C $($Ramp to freeway$)$ volume $\backslash (=700\backslash$mathrm$\{$vph$\}\backslash )$

B$-$D $($Ramp to ramp$)$ volume $\backslash (=1100\backslash$mathrm$\{$vph$\}\backslash )$

Assume LB$=1800$ ft