Abstract

The braking process is composed of drivers' brake reaction and drivers' deceleration after braking. In order to understand driver's collision avoidance behavior, it is important to understand how drivers maneuver after braking. Experiments were conducted on the Tongji University Driving Simulator to analyze the behavior of drivers after braking with different lead vehicle's (LV) decelerations (0.3g, 0.5g, 0.75g) and different initial headways (1.5s, 2.5s). Among the 140 cases where drivers avoided collisions only through braking, difference of drivers' collision avoidance behavior were compared by brake pedal rate, time to 25% brake, time to 50% brake, and time to maximum brake. Results indicated that a) brake pedal rate was faster under higher level of risk; b) experienced drivers tended to have higher brake pedal rate compared with the novice drivers; and c)compared with the change in LV's deceleration, driver was more sensitive to the change in braking headway.

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