Getting Started - Page 2 of 5 |
ID# C1GS002 |
Getting Started
Stakeholders
The Idaho Transportation Department has primary authority for the
operation of U.S. 95. It does all of the planning, design, and maintenance of
this highway. However, it works closely with the staff from the City
of Moscow so that, as much as possible, decisions regarding the state
highway facilities within city limits are made jointly between the city and
the state. As we develop the results from our analyses, the major
audience, then, will be the engineering staffs from these two agencies.
In addition, residents of the city will need to understand
the rationale for any final decision that is made regarding the intersection
and whether a signal should be installed or not. This points up an
important issue in any technical analysis. While any analysis must be
technically sound and based on standard methods of professional practice, it
must also be presented in such a way that it is understandable by decision
makers and elected officials (who often do not have technical backgrounds)
as well as the general public. This is particularly important as we
consider such concepts as level of service, and as we talk about sensitivity
analysis and the relative certainty that we have in our final results.
Goals
The major reason for conducting the analyses that makes up this case
study is to provide decision makers with sufficient information about the
performance of the intersection of U.S. 95/Styner Avenue/Lauder Avenue so that
they can decide whether the intersection should be signalized or whether it
should remain stop-sign controlled. The Highway Capacity Manual provides
estimates of delay, volume/capacity ratio, queue length, and other data that
are helpful to decision-makers in making this kind of decision.
We
should also point out that the Manual on Uniform Traffic Control Devices (MUTCD)
is commonly used to determine if a signal is warranted and in most
jurisdictions is the legal document used to determine many of the
characteristics of a design. However, it is also useful to compare the
forecasted operations of an intersection under different control scenarios. The Highway Capacity Manual provides the tools for such an operational
analysis.
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