Abstract
It is important to consider adequate designs of display interfaces in order to avoid drivers' confusions caused by a lot of information in vehicle when some driver support system functions were worked simultaneously. This research aims to investigate ways of selecting visual and auditory displays to facilitate drivers' adequate expectations of mode changes of system functions when two kinds of the functions are worked simultaneously. The results of driving simulator experiment found that it was important to use physical features of visual and auditory displays based on priority of each information in starting up two functions. The results also revealed that if two functions were worked to the same emergency situation, it is necessary to present visual and auditory displays for the only one mode of a function which had higher priority. On the other hands, if two functions were worked to the different situations respectively, it may be important to use visual and auditory displays on each function to show occurrences of two different events.
