Problem 6-Analysis

Simple as they may be, planning-level analyses such as the ones conducted in this problem are powerful tools for the planner, designer, and engineer. Often, the underlying objectives (i.e., the questions that are being asked and the reasons the analyses are being undertaken) can be addressed with an adequate level of accuracy and reliability by planning-level analysis methods. In such cases, these first-order methods usually represent the most cost- and time-efficient means for addressing the underlying objectives of the investigation, and the increased accuracy available from more sophisticated and complex methods is neither warranted nor needed.

It is important to note that critical review and interpretation skills are necessary even when applying such simple analysis methodologies as the planning-level techniques described in this problem. Sub-problem 6d, in particular, illustrates how a careful and critical review of the initial model outputs leads to a different conclusion than the model initially suggested.

A particular strength of the planning-level analysis methodology used in this problem is its ability to guide the analyst to an appropriate intersection design. The relationship between the intersection's geometric characteristics and resultant operational performance measures is clearly delineated by this method, making it a particularly useful tool for highway designers and planners as well as operational engineers.