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Human interfaces are proliferating in vehicles due to increasing convenience features and information systems. Development of simple and safety conscious interfaces are necessary for driver operability and enjoyment. Two emerging technologies enabling new approaches to human interfaces are: 1. Information network systems (INS); 2. Interactive voice systems (IVS). The INS supports the effective combination of multi-function switches and multi-function displays configured through software and enables optimum location of such devices separate from the information or entertainment units themselves. IVS adds another dimension to human interface design as a "hands-free, eyes-free" safety conscious interface for many applications. Th paper describes the methodology and the effects of interactive and multi-modal HI by integrating IVS and INS in an optical information network that achieves efficient and simple vehicle/human interfaces.

In order to cope with the rapid development of the ITS and the future information society, it has become necessary to build an in-vehicle information network system with high expandability which is capable of safely providing an increasing volume of information to passengers. This networking will not only promote the standardization of various instruments, but will also make it possible to integrate SW and display functions which are attached to those individual instruments and to make them more independent, thereby allowing the existing instruments to be more clearly visible and more easily operable. In this paper, the relationship between visual-recognition time and operation time in the display-operation system (as a human interface with the center cluster section when the above-mentioned network was designed) will be evaluated using a simulator.