Problem $4(8$ pts$)$

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 $3,000vph.$

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

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

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

d$)$ What is the level of service during the peak period? $(1$ pt$)$

e$)$ What design changes $($how many lanes$)$ would you recommend, to enhance the level of

service to B$?(2$ pts$)$