Analysis of Naturalistic Driving Study Data: Roadway Departures on Rural Two-Lane Curves (2014) / Chapter Skim
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10 C h a p t e r 3 This chapter describes the process for obtaining and reducing the different NDS data sets used in the present analysis. A further description of the data reduction effort for each specific analysis is included within each corresponding section.
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11 significant portion in which the surrounding area appeared to be more urban than rural. Fourteen buffers and 32 curves were identified in Florida in Phase 1, and the remaining were identified in Phase 2.
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12 Florida New York Pennsylvania North Carolina Indiana Source: World_Topo_Map (Esri, HERE, DeLorme, TomTom, Intermap, Increment P Corp., GEBCO, USGS, FAO, NPS, NRCAN, GeoBase, IGN, Kadaster NL, Ordnance Survey, Esri Japan, METI, Esri China [Hong Kong] , swisstopo, MapmyIndia, © OpenStreetMap contributors, and the GIS User Community)
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13 in Florida were identified. Buffers representing geographic boundaries around each curve were developed and submitted to VTTI.
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14 After removing traces with problematic data, a total of 137 initial usable traces through the various curves were identified. Researchers realized that requesting one forward roadway view for each segment would have allowed the team to identify locations where roadway conditions had changed or construction was present.
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15 downloaded by the DAS in certain types of vehicles. Significant noise was also present in the alcohol measure, and it was not certain whether potentially alcohol-impaired drivers could be identified.
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16 of data requests, the filtering process could not be fine-tuned as much as needed, so the CTRE/ISU team ended up reviewing a large number of traces that ultimately were not viable. This problem will likely have been addressed by the time final data quality assurance has been conducted by VTTI.
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