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CHAPTER 6 L07 Analysis Tool 6.1 Overview of the L07 Analysis Tool The analysis tool developed under Project L07 is more complex than the C11 Reliability Analysis Tool. The L07 Analysis Tool is designed to analyze the effects of highway geometric design treatments on nonrecurrent congestion using a reliability framework. It provides an easy- to-read user interface that allows for a wide array of site inputs: ⢠Site geometry ⢠Traffic demand ⢠Incident history ⢠Weather ⢠Special events ⢠Work zones The L07 Analysis Tool was originally designed to illustrate the benefits of various operational design strategies, since these benefits were difficult to show without modeling. As a result, the tool has built-in custom algorithms for modeling 16 different treatments using relatively simple input data on the treatment effects and cost parameters. These algorithms are based upon rules of thumb identified from literature reviews. They replace the need for the user to make adjustments, such as the ones described earlier for the C11 tool (if an appropriate treatment is available in the tool). In addition, the tool includes three custom treatments that allow the user to tailor the analysis if a specific treatment is not available for the strategy being tested. These three custom treatments plus the 16 tailored treatments result in 19 treatments available to the user for modeling: ⢠Accessible shoulder ⢠Alternating shoulder ⢠Anti-icing systems ⢠Blowing sand ⢠Control (gated) turnarounds ⢠Crash investigation site ⢠Drivable shoulder ⢠Emergency access ⢠Emergency crossovers ⢠Emergency pull-off ⢠Extra high median barrier ⢠Incident screen ⢠Moveable cable barrier ⢠Runaway truck ramp ⢠Snow fence ⢠Wildlife crash reduction ⢠Custom treatment flow ⢠Custom raw treatment ⢠Custom treatment incidents 100
