Browse Publications Technical Papers 2020-01-0884
2020-04-14

Driver response to right turning path intrusions at signal-controlled intersections 2020-01-0884

Previously researched path intrusion scenarios include left turning hazard vehicles which intrude laterally across the path of the through driver. A right turning vehicle, however, creates a scenario where a hazard which was initially traveling perpendicular to the driver can intrude into the through driver's path without also occupying the adjacent through lanes. This hazard scenario has not been previously investigated. The purpose of this research was to determine driver response time (DRT) and response choice to a right turning vehicle that merges abruptly into the lane of the oncoming through driver. A study was conducted using an Oktal full car driving simulator. 107 licenced drivers (NFemale=57, NMale=50) completed a short practice drive followed by an experimental drive containing two conditions of the right turn hazard, presented in a counterbalanced order. In one condition, the hazard vehicle was stopped at the stop bar before accelerating into the path of the participant driver. In the other condition, the hazard vehicle approached the intersection and turned at a constant speed. DRT was defined as the time between when the hazard vehicle crossed the stop bar and when the participant driver reacted by touching the brake pedal or swerving. There was a significant difference in DRT (p<0.001) between the two hazard conditions with drivers responding earlier to the right turning vehicle when it was initially in motion than when it was initially stopped at the stop bar. In both scenarios, approximately half of the through drivers swerved in response to the hazard vehicle, and although steering responses trended toward longer DRTs than braking responses, there was no significant difference in collision rates (p=0.205) between the two hazard types.

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