Naturalistic Driving Study: Descriptive Comparison of the Study Sample with National Data (2015) / Chapter Skim
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4C h a p t e R 2 It was considered important to sample from as broad a range of environmental and geographical conditions as feasible to better understand how these elements interact with driver, vehicle, and roadway factors and to sample from as broad an array of these conditions found in the United States as possible. However, considering the nation's vast area, it would be impossible for any six sites to adequately represent its entirety.
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5 Figure 2.1. Six data collection sites and nominal distribution of the DAS kits.
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6Source: Blatt et al.
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7 Source: Blatt et al.
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8Figure 2.7. Pennsylvania recruitment area and expanded view.
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9 corresponds to the number of DAS kits allocated to each site. Two of the three sites with the greatest number of kits, New York and Florida, were also the two highest in population density.
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10 Source: U.S. Census Bureau 2010b.
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11 Source: National Oceanic and Atmospheric Administration 2014. Figure 2.12.
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