Analysis of Naturalistic Driving Study Data: Roadway Departures on Rural Two-Lane Curves (2014) / Chapter Skim
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Pages 17-25
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17 C h a p t e r 4 This chapter describes how roadway, driver, and environmental data were reduced. Some additional data reduction may have been conducted for a specific research question and is described in the corresponding data section for that research question.
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18 Table 4.1. Roadway Variables Extracted and Main Source Feature ArcGIS SHRP 2 RID Google Earth SHRP 2 NDS Forward Video Curve radius Distance between curves Type of curve (isolated, S, compound)
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19 • Head confidence • Head position x • Head position y • Head position z • Headlight setting • Lane marking, distance, left • Lane marking, distance, right • Lane marking, probability, left • Lane marking, probability, right • Lane marking, type, left • Lane marking, type, right • Lane position offset • Lane width • Pedal, brake • Pitch rate, y-axis • Radar range rate forward x • Radar range rate forward y • Roll rate, x-axis • Seatbelt, driver • Spatial position (lat/long) • Speed, vehicle network • Steering wheel position • Time into trip • Timestamp • Wiper setting • Yaw rate, z-axis The static driver and vehicle characteristics available include the following: • Driver 44 Driver age 44 Gender 44 Education level 44 Annual miles driven 44 Years of driving 44 Number of moving violations 44 Number of crashes • Vehicle 44 Vehicle year 44 Vehicle model 44 Vehicle make 44 Vehicle track width Smoothing Vehicle variables were either available (i.e., acceleration, position, lane offset)
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20 Information on the make, model, class, and track width of each vehicle was also linked using the subject ID. In addition, the subject ID was used to link the driver demographics, such as the following: • Gender; • Age; • Education; • Work status; • Household income; • Number of miles driven last year; • Average annual mileage for the last 5 years; • Experience (i.e., number of years driving)
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21 made, but only 515 total traces could be coded. These included one crash and three near crashes.
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22 was more direct. External light sources at night, such as street lights, created the same effect.
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23 viable traces is shown in Figure 4.3. A number of drivers had multiple trips.
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24 Month: August Time of day: Midnight to 3:00 a.m. Type of crash: Run-off-road Description of site: This crash occurred on the second curve of an S-curve in rural Washington State.
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25 is 45 mph, with lanes approximately 3.5 m wide. There are paved shoulders and a curve advisory sign alerting drivers to the curve.
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