The development of new visual displays and speach synthesizers leads to the on board presentation of additional information to the car driver. A series of laboratory and field experiments was carried out to compare visual, auditory, and partly combined presentation of binary and textual information. From the results recommendations for practical design can be given. Binary alarms which occur seldomly and with high priority have to be a dynamic signal, e. g. a blinking lamp optionally supported by an intermittent auditory signal. For textual information a voice warning system is recommended.
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