Abstract
To reduce rear-end crash, it is important to judge necessity of deceleration assistance as earlier as possible and initiate the assistance naturally. On the other hand, we have derived a methematical model of driver's perceptual risk of proximity in car following situation and proposed driver deceleration model and deceleratin control mehtod. In this research, we will discuss a method to build deceleration control method to realize comfortable driver assistance by considering how assist initiates and where to be converged and how to connect these two based on the driver's perceptual risk.
