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.