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58 Chapter 5. Safety Frameworks The main objective of the research conducted for this project was to develop analytical methods (Safety Frameworks) that could be used as templates by other stakeholders to evaluate distractions associated with infrastructure features. Each of the resulting Safety Frameworks includes a discussion of the type of data that can be used for the analysis, reasonable surrogates that can be used to infer distraction (e.g., SCE, lateral position, glance location, deceleration), and the types of analyses that may be feasible for the type of data. Four categories of analysis encompassing a total of five Safety Frameworks were developed to evaluate the causes and severities of IRD crashes or surrogates. These categories include analyses of crash narratives, geospatial crash data, NDS data, and traffic simulator data. One Safety Framework each was developed for the crash narrative data, geospatial crash data, and traffic simulator data categories. Two Safety Frameworks were developed for the naturalistic driving study data category because two different viable SHRP2 NDS data sets were available. These two frameworks are reasonably similar but are presented separately for ease of review. Each Safety Framework evaluates IRD from a different perspective using different sources of data. The research team first outlined the frameworks and then used existing data sets that were available to the team to assess the efficacy of each approach. Since resources were not available to collect or reduce additional data, sample sizes were limited. However, the project objective was to assess the utility of the approach rather than answer a specific research question about the distraction potential of an individual asset. Each Safety Framework consists of the following: ⢠Overview of the type of analysis conducted. ⢠Research question(s) evaluated. ⢠Data sets utilized (data sets are described in more detail in Chapter 4). ⢠Description of the analysis conducted, including variables used, statistical methods, and results. ⢠Discussion on the efficacy of the approach, including the following: o Feasibility of the data sets utilized. o Assessment of the sample size needed to conduct a similar analysis. o Performance of the statistical models developed. o Discussion of utility of the approach in general. The Safety Frameworks are summarized in Chapters 6 through 10.
