Problem 3: Analysis

We will now consider the concepts presented in each of the three sub-problems.

In sub-problem 3a, we consider the special event-related traffic conditions that necessitate a second look at the intersections during event traffic. In this analysis we considered key concepts such as oversaturated conditions and demand volume. Specifically, we analyzed traffic across multiple scenarios, where demand exceeds capacity and arrivals from one scenario are served in the adjacent time period. In this case, we are able to analyze a scenario that provides an insight into oversaturated conditions. Where volume exceeds capacity, the collection of demand volumes becomes critical to our analysis in order to capture the effect of oversaturated conditions. This is a challenge that requires significant investment in data collection.

In sub-problem 3b, we utilize a simulation model to analyze the conditions. Our analysis using the simulation model provides us with an opportunity to test a variety of variables to determine the effect of specific measures and changes.

Finally, in sub-problem 3c, the concept of critical movement analysis is used to exhibit another methodology for determining whether an intersection is at or near capacity.

Discussion:
The ability of a traffic signal to handle fluctuations is a function of the signal timing that is in the controller in the field. In time period 3 (4:30 - 4:45 pm) of our previous analysis, we changed the green ratio slightly to serve the traffic at the post-game traffic at the intersection. Would this green ratio be possible under the existing pre-timed control? Take a few minutes to identify other factors that you think should be considered in this analysis, and continue to the next page when you are ready.