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CEE 122
Traffic Engineering
Spring 2010
Homework #10
Due: __________________
1.
A one mile segment of new freeway is being planned through an urban area with an
average grade of +4% and a forecast AADT of 75,000 veh/day.
The directional split is
anticipated as 55/45, and the forecast peak hour factor (K) is 0.090.
What is the
minimum number of lanes needed to provide at least LOS D during the peak hour?
Assume FFS=70 mph, commuter traffic, PHF = 0.90, 10 percent trucks, and 0 percent
RVs.
2.
For an analysis of freeway capacity and level of service, identify the eight conditions
corresponding to an idealized speedflowdensityrelationship that need to exist so
that the freeway is co
nsidered to operate under “base conditions”.
3.
Draw a simple line sketch to illustrate the 4 different types of freeway segments
according to Highway Capacity Manual (HCM) analysis methodology: (1) Basic
segment; (2) Merge or On segment; (3) Diverge or Off segment; and (4) Weaving
segment.
4.
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 '09
 Yu,Oliver

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