Example $9\mathrm{.}4$ Computation of Speed, Density, and Level of Service for an Extended Freeway Segment with

Mixed Traffic in General Terrain

Determine the LOS on a regular weekday on a $0\mathrm{.}40-$mi section of a six$-$lane freeway

with a grade of $2$ percent, using the data shown in Step $1.$

Step $1.$ Input data.

Hourly volume, $V=3000ve\frac{h}{h}$

$FFS=70m\frac{i}{h}($measured$)$

PHF $=0\mathrm{.}85$

Traffic composition:

Trucks $=12\%$

$RVs=2\%$

Lane width $=11ft$

Number of lanes $=3$

Terrain category: Level

Shoulder width $=6ft$

Driver population adjustment factor $f_n=0\mathrm{.}9($unfamiliar drivers$)$