Visual requirements of vehicle guidance systems: Central versus peripheral preparatory information display


Type de document
Résumé / Abstract
Implementation of navigation and guidance systems will have direct consequences on strategic level: giving directional indications to the driver will help him to find easily his route, and, consequently, will facilitate orientation processes. In this framework, ergonomics approach concerns visual demands created by reading on-board displayed information. The possibility for individuals to have previous information on future events makes further action quicker and more precise. The hypothesis set up in this study is that preparatory processes will make orientation system use easier. To investigate this aspect, a guidance system was implemented in a vehicle cockpit; its screen, displayed directional arrows in order to guide the driver during his trip, in synchronisation with environmental cross-roads. Previous information, allowing to reduce timing uncertainty about arrow appearance, was displayed in central versus peripheral driver's visual field. In order to evaluate preparation efficiency, these two situations has been compare to a reference situation with no previous clue on directional information happening. The tested sample included young and elderly drivers. Visual strategies were analysed in terms of glance duration and frequency toward the screen, and according to various informational sources. A questionnaire allowed to investigate subjective evaluation of the two preparatory conditions in terms of preference and constraint. Advantages in warning the driver according to the preparatory signal location in its field of view has been established.

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