**Sub-problem 1a: Analysis of the
existing TWSC intersection**

Let's discuss each of these issues and how each affects
the operational analysis that we are about to complete.

*Which tool or tools from the HCM should be used for
this analysis?* The analysis tools for unsignalized intersections are
contained in chapter 17 of the HCM 2000. Chapter 17 includes analysis tools
for two-way stop-controlled (TWSC) intersections, all-way stop-controlled (AWSC)
intersections, and roundabouts. In this analysis, we will use the procedure
for TWSC intersections. Since we are interested in existing conditions at
the intersection, at a fairly detailed level, we will use the operational
analysis procedure in chapter 17.

*What data are required for the analysis? *Since we
are interested in determining the average control delay that drivers
experience at the existing intersection, we will use the operational
analysis method that is included in chapter 17 of the HCM. The following
data are needed to conduct an operational analysis: