A basic freeway has the following characteristics: $4-$lane cross section, $10ft$ lane widths, lateral obstruction at $0$ feet from the pavement edge, total ramp density $=3$ramp$\frac{s}{m}$ile, rolling terrain, percentage of trucks $($typical mix$)=2\%,$ peak$-$hour factor $=0\mathrm{.}95.$

The current peak$-$hour demand in the peak direction is $3,000$ vph$,$

a$)$ What is the free flow speed for the basic freeway? $(2pts$

b$)$ What is the peak flow rate in pephpl? $(2$ pts$)$

c$)$ What is the travel speed at this peak flow rate? $(1$ pt$)$