Drivers’ ability to distinguish consecutive horizontal curves

Abstract

Driver error in distinguishing preceding and upcoming horizontal curves can lead to single-vehicle fatal crashes. The 3D perspective views of different horizontal curve stimuli were used to examine a representative sample of volunteering drivers’ ability to distinguish consecutive horizontal curves. A probit model, developed using the recorded responses, revealed that differences in radius and deflection angle between the consecutive curves are more likely to influence, whereas radius and deflection angle of reference curve are less likely to influence drivers in distinguishing consecutive curves. The sensitivity analysis of the model parameters indicated a difference in radius between the consecutive curves as the most and deflection angle of reference curve as the least sensitive parameters. The estimated marginal effects are useful for evaluating the design and safety of consecutive curves from the drivers’ perspective. Finally, nomograms were developed for relevant applications.