Sub-problem 2a - Page 1 of 4
Sub-problem 2a: What
types of analysis should be conducted on the I-87/Alternate Route 7 interchange?
Step 1. Setup
We first need to determine the types of analysis that we
will conduct on the I-87/Alternate Route
7 interchange. We know from the HCM 2000 that there are four facility
types: a basic freeway segment, a ramp junction, a weaving section, and a
freeway facility (in which the three previous types are integrated together
into a facility). One of the common challenges in a traffic analysis
is to match the geometry found in a real problem with the four facility
types described in the HCM. It is useful as we start this problem to
determine which types of facilities are present in this interchange as we
have defined it.
4-19 shows the interchange, both with a base map showing the named
roadway segments and a schematic showing how the road segments intersect.
Each of the schematic links is on the mainline of the freeway, a connector
roadway, or a ramp. Study the map to better familiarize yourself with the
components of the interchange.
Consider the information presented in the
figure above showing the various elements of the I-87/State Road 7
interchange. If necessary, go back to the previous pages and study the
Exhibits presented on these pages. After reviewing this
information, list the segments that you think should be analyzed and
identify what facility types they represent. When you are ready, proceed to the
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