Subproblem 2b - Page 2 of 10

ID# C402B02

Sub-problem 2b: What are the Levels of Service in the Weaving Sections Located in the I-87/Alternate Route 7 Interchange?

Now let's review each of these questions and discuss why they are relevant to this analysis.

What type of analysis will produce an evaluation of traffic conditions present at the weaving sections? The Highway Capacity Manual (HCM) includes two kinds of analysis, depending on the problem that the analyst is attempting to address. An operational analysis produces an estimate of level of service, based on a detailed analysis of existing or projected traffic, geometric, and control conditions. A design analysis produces a value of a geometric parameter that will produce a given level of service. Here we will focus on an operational analysis of the weaving section.

What data are needed to analyze the operations of these weaving sections? The weaving analysis procedure, documented in Chapter 24 of the HCM, requires the following input data:

	the freeway free-flow speed
	the number of lanes in the weaving section
	the length of the weaving section
	the terrain topography (level or rolling)
	the configuration (type) of the weaving section
	the weaving volumes
	the peak hour factor
	the percentage of heavy vehicles present in the traffic stream

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