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CHAPTER 5 C11 Reliability Analysis Tool 5.1 Overview of the C11 Reliability Analysis Tool The Reliability Analysis Tool developed under Project C11 is a sketch planning tool for facilities. The C11 tool is intended to help users incorporate reliability analysis into a standard benefit-cost analysis framework by providing estimates of reliability impacts and monetizing those impacts using a reliability ratio and value of travel time. Although the original purpose of the tool is to support benefit-cost analysis, it also provides a simple sketch method for estimating the reliability impacts of projects. The Reliability Analysis Tool was developed in a Microsoft Excel workbook and estimates travel time index (TTI), delay, and congestion costs using a simple user interface. Figures 5.1 and 5.2 provide examples of the user interface and result summary screen. The tool requires input data that are relatively easy to collect and enter, and the output data are easy to find. The study team found the tool relatively easy to use and believes that the C11 tool serves its purpose as a quick sketch planning tool. However, users need to be familiar with model calibration principles in order to have the tool match ground-truth conditions as well as traffic engineering principles to effectively apply the tool to the analysis of potential mitigation strategies. Figure 5.1. Project C11 Reliability Analysis Tool user interface. 70
