Browse Publications Technical Papers 2018-01-1626
2018-08-07

Driver Risk Perception model under Critical Cut-in scenario 2018-01-1626

In China Cut-in scenario is quite common on both highway and urban road with heavy traffic and usually has a certain risk. While, research on the driver’s risk perception of Cut-in scenario is few. When facing a cutting-in vehicle, driver tends to brake in most case. The timing and dynamic characteristic of driver’s brake maneuver is the direct indicator of driver’s subjective risk perception. The objective risk evaluation factors include TTC (Time to collision), THW (Time Headway), longitudinal relative distance and lateral relative distance et al.. This paper aim at building a model quantitatively revealing the relationship between drivers’ subjective risk perception and the objective risk evaluation factors. Data is from China-FOT database, which has a travel distance about 130 thousand miles. It is found that in Cut-in scenario, driver tends to brake when the cutting-in vehicle right crossing line, and this time point is defined as initial brake time t_IB. Average brake pressure (ABP) and acceleration at t_IB indicate brake strength. Brake pressure change rate (BPCR) and longitudinal jerk (derivative of acceleration) at t_IB indicate the brake speed. Analytic Hierarchy Process and Fuzzy comprehensive evaluation method are used to obtain an integrated subjective risk perception parameter. Result shows that at different longitudinal relative distance the main objective evaluation factors change. The distance is divided into four groups and the models depicting relationship between subjective and objective risk evaluations in four groups are distinct. As distance is small, 1/THW have a linear relation with subjective risk perception. But as distance is large, both 1/THW and 1/TTC have effect on the matter.

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