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Getting Started - Page 3 of 5 |
ID# C1GS003 |
Getting Started
Performance Measures
The Highway Capacity Manual provides several performance measures for
intersections, both signalized and unsignalized. For both of these
types of intersections, the primary measure of effectiveness is control
delay. Control delay is directly related to level of service, a range
of levels that categorize performance from the point of view of the driver,
or the user of the highway system. Level of service (along with delay)
will be used here to help us determine if the intersection of U.S. 95/Styner
Avenue/Lauder Avenue should be changed from stop sign control to signal
control.
We will also need to consider other performance measures
besides just level of service in order to fully judge the overall
performance characteristics of the intersection. Depending on the type of
control at the intersection, these may include the volume/capacity ratio of
the critical movements at the intersection, the traffic signal cycle length,
and/or queue length considerations.
Analyses
We must complete several computations in order to gather the required
information on the performance of the U.S. 95/Styner-Lauder Avenue
under both stop sign and signal control. For convenience, we've
divided the analyses into six parts or problems. We will consider
each problem separately. We will also see that each problem consists
of several separate computations, using the Highway Capacity Manual or other
tools, such as TRANSYT 7F or CORSIM.
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In
Problem 1,
we will study the intersection under both stop sign and signal control under
both present and future traffic conditions, for the typical weekday found in
Moscow, Idaho.
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In
Problem 2, we will consider these same conditions, but
within the context of the U.S. 95 arterial as a whole. Here, we will
particularly focus on the effect that the adjacent intersections have on the
U.S.
95/Styner-Lauder Avenue intersection, and how a new signal at this
intersection must operate in conjunction with the adjacent signalized
intersections.
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In
Problem 3, we will consider other time periods,
including traffic volumes during special events at the University of Idaho
and during different times of the year, when the mix of vehicles in the
traffic stream changes.
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In
Problem 4, we will consider how we can forecast the
performance of the U.S. 95/Styner-Lauder Avenue intersection when an
actuated traffic controller is used.
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In
Problem 5, we will consider the operation of the
highway outside the city limits, where it is operating as a two-lane highway.
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In
Problem 6, we will consider the less detailed planning
analysis and what information it can tell us about future operations of the
intersection and the corridor. |
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