Analysis of Naturalistic Driving Study Data: Roadway Departures on Rural Two-Lane Curves (2014) / Chapter Skim
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Pages 44-50
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44 C h a p t e r 8 This chapter discusses the third research question: What is the relationship between driver distraction; other driver, roadway, and environmental characteristics; and roadway departure risk? Research Question 3 investigates how driver behaviors in conjunction with roadway and environmental factors affect the likelihood of a roadway departure on rural two-lane curves.
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45 Variables Used for research Question 3 Table 8.1 shows the reduced kinematic variables used in this analysis. The two response variables included in the analyses are (1)
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46 These characteristics were reduced to the event level (see Table 8.1)
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47 10% of total time upstream of the curve. This value is given by the following: exp 0.10 0.81901( )
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48 where x1 = driver age (years) ; x2 = fraction of time following another vehicle 200 m upstream of the curve; x3 = average speed 200 m upstream of the curve (m/s)
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49 Parameter estimates, p-values, and 90% Wald confidence intervals are provided in Table 8.8. The odds ratios and 90% Wald confidence intervals are shown in Table 8.9.
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50 less likely to have a right-side encroachment on roadways with a guardrail. The model for left-side encroachments indicated that males are more than four times more likely to have a left-side lane departure, and drivers traveling on the inside of the curve are 0.1 times less likely to have a left-side encroachment than drivers traveling on the outside of the curve.
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