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Ergonomics and Safety of Intelligent Driver Interfaces

By: Y. Ian Noy | Book details

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Page 166
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Display fixation duration (a) (b) (c) FIG. 8.15 . Effect of voice guidance.

CONCLUSIONS
1. The available attention diversion time is about 1-2 sec.
2. The operation of user controls should be completed within 1-2 sec.
3. Legibility and comprehension of displayed information:
Character size: within .27-.75 degrees
Combination of colors: luminance contrast (character to background) 1.5 when the chromaticity difference between the characters and background is zero.
Background luminance: reflection and glare should be minimized.
Map orientation: south-up orientation when the vehicle is pointed south.
Amount of information: the number of crossings 5.
4. Human interface specifications for voice guidance and their effectiveness:
1. The timing to provide information: surface roads--700 m before lane change, 300 m before intersection; expressways--300 m before intersection, 2 km before junctions and exits.
2. Effectiveness of voice guidance: Reduction of visual and mental workload was confirmed.

REFERENCES

ANSI/HFS 100-1988, American National Standards for Human Factors Engineering of Visual Display Terminal Workstations.

Freundschuh S. M. ( 1989). Does "anybody" really want (or need) vehicle navigation aids? 1989 IEEE, 439-442.

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