Abstract
When a vehicle is equipped with two or more driving support functions as compared with a single driving support function, the driver has need to understand the contents of each driving support function. If the driver does not understand each function enough, the drivers' operation for risk avoidance may be delayed. In this study, each alarm sound was designed in consideration of drivers' mental model related to the collision to the preceding car or lane deviation. The drivers' operation was evaluated through the Monte Carlo simulation which was based on results in a driving simulator. As a result, two different kinds of driving support alarm systems showed that the drivers' risk-avoidance behavior to avoid collision or lane deviation was not worsen when two alarm functions were mounted, compared with the situation when the single alarm function was mounted.
