Effects of Time-gap Settings of Adaptive Cruise Control on Driver's Risk Feeling on Snowy Roads

抄録

The present study revealed how time-gap settings of Adaptive Cruise Control (ACC) affect a driver's risk feeling (RF) closing with a lead vehicle on snowy roads. A field experiment on the test truck was conducted to measure changes of the RF according to the time-gap settings on snowy roads. We proposed a model to estimate value of the RF when the lead vehicle decelerated on snowy roads. Also, parameters for the car-following model with ACC were estimated using results of the field experiment. This study indicated driver's acceptable time-gap settings on dry and snowy roads in terms of value of the RF. These results give quantitatively support following two facts, the time-gap should be long and deceleration should be low on snowy roads in order to over driver's acceptable risk feeling.