Formulation of deceleration behavior of an expert driver for automatic braking system

In order to develop more effective automatic braking system or other braking support system, comfort of drivers should be taken into account. In this paper, deceleration behaviors of an expert driver in car following will be formulated as an example of comfortable braking behavior. The difficulty of its formulation is how to extract characteristics of the deceleration behavior. Expert driverpsilas braking behavior will be formulated using our proposed indices representing driverpsilas perceptual risk of collision from visual input. It will be shown that smooth deceleration profiles will be uniformly generated with very simple calculation for wide range of approaching conditions. Brake initiation timing will be also modeled by brake judgment line based on the proposed indices.