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Analysis of Naturalistic Driving Study Data: Roadway Departures on Rural Two-Lane Curves (2014) / Chapter Skim
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Pages 37-43

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From page 37...
... 37 C h a p t e r 7 This chapter discusses the second research question: What defines normal curve negotiation? A methodology proposed by several other researchers was used to develop a relationship between tangent speed and off­ set and curve speed and offset, which was used to define nor­ mal curve driving.
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From page 38...
... 38 In addition, as noted previously, a moving average method was used to smooth data across rows (0.5­s intervals) to reduce noise present in the variables.
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From page 39...
... 39 Table 7.2. Variables Used for Research Question 2 Variable Description Curve PT Factored variable that indicates the position in the curve from which data are sampled (PC, C1, C2, C3, C4, or PT)
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From page 40...
... 40 "EventID" as the individual and "Point in Curve" as the time setting. The Breusch­Pagan Lagrange multiplier test found that no panel effect was present; therefore, an ordinary least squares (OLS)
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From page 41...
... 41 which is just past the point of curvature, the average position is 0.17 m to the right of the center of the lane. At position C2 the average position is 0.19 m.
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From page 42...
... 42 because drivers who are traveling over the speed limit in the tangent are also likely to speed within the curve. Speeds are expected to be 2.8 km/h (1.7 mph)
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From page 43...
... 43 can lead to roadway departures. Knowing how much drivers normally deviate in their lane, as well as how they choose their speed, could potentially have implications on policy or design.
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