$(6\mathrm{.}5)$ A six$-$lane freeway $($three lanes in each direction$)$

in a scenic area has a measured free$-$flow speed of

$55m\frac{i}{h}.$ There are $7\%$ SUTs and $7\%$ TTs in the traffic

stream. One upgrade is $5\%$ and $0\mathrm{.}5mi$ long. An

analyst has determined that the freeway is operating

at capacity on this upgrade during the peak hour. If

the peak$-$hour traffic volume is $3900$ vehicles, what

value for the peak$-$hour factor was used? $($Hint: use

Table $6\mathrm{.}7$ and interpolation to get $E_T).$Please do not use Chet gpt otherwise I will give you $10$ dislike.