PROBLEM $6\mathrm{.}3$

HW $2,$ Problem $3.$

SOLUTION

An undivided multilane highway segment has two $11-$ft lanes in the eastbound

direction with no shoulders and a $55m\frac{i}{h}$ speed limit$.$ This highway segment has $40$

access points on a $1\mathrm{.}25$ mile, $2\mathrm{.}5\%$ upgrade. During the highest $15$ minutes of traffic$-$

flow within the peak hour there are $755$ vehicles and $12\%$ of these are heavy vehicles

with a $70\frac{\%}{30}\%$ mix of single$-$unit and tractor$-$trailer trucks. What are the estimated

speed, density, and level of service of upgrade?

Note: Open boxes in equations $"$

$"$ are to be completed by the reader

We begin by determining the free$-$flow speed according to Eq$.6\mathrm{.}14,$

$FFS=BFFS-f_{L{W}^{\text{'}}}-f_{TLC}-f_M-f_A$

In this equation,