The study highlighted that longer retention intervals led to more errors (23% errors after 1 min, 33% after 3 min) and message providers should be aware of this pattern of forgetting over time. However, the ideal timing for messages requires further research, particularly into situations where the driver has a realistic incentive to remember the message content.
Finally, the study has shown that older drivers can remember travel and traffic information presented on screen as well as younger drivers, but have difficulties with the most complex messages. This suggests that although older drivers may be comfortable with the concept and implementation of an in-vehicle information system, they experience problems reading, encoding, and retaining complex messages. Visual difficulties found with the older eye could be overcome to a certain extent by providing controls to adjust the brightness, contrast, and saturation of the screen to drivers' personal preferences. Increasing the presentation duration or allowing the older driver to control pacing should improve the assimilation of messages. Overall, the simplification of message content, as described earlier, will improve both the assimilation and retention processes for the full range of drivers.
Bhandal A. S., & Palmqvist U. ( 1993). "Driver information and traffic control using short range vehicle roadside communications." In Proceedings of the Autotech '93 Conference, Seminar 9. PROMETHEUS--Future Systems. Birmingham, England: Institution of Mechanical Engineers.
Bhandal A. S., & Richardson M. J. ( 1992). "Future applications for short-range vehicle/ roadside communications links". In IEE Colloquium on PROMETHEUS and DRIVE (pp. 7.1-7.5). London: Institute of Electrical Engineers.
Gatling F. P. ( 1975). Auditory message studies for route diversion (Rep. No. FHWA-RD-75-73). Washington, DC: Federal Highway Administration, U.S. Dept. of Transportation.
Gatling F. P. ( 1976). The effect of auditory and visual presentation of navigational messages on message retention (Rep. No. FHWA-RD-76-94). Washington, DC: Federal Highway Administration, U.S. Dept. of Transportation.
Graham R., Mitchell V. A., & Ashby M. C. ( 1995). "An analysis of driver requirements for motorway traffic information." In S. A. Robertson (Ed.), Contemporary ergonomics 1995 (pp. 281-286). London: Taylor & Francis.
Labiale G. ( 1989). "Influence of in car navigation map displays on drivers performances." Vehicle/highway automation: Technology and policy issues, SAE SP-791 (pp. 11-18). Warrendale, PA: Society of Automotive Engineers.
Labiale G. ( 1990). "In-car road information: comparison of auditory and visual presentations." In Proceedings of the Human Factors Society 34th Annual Meeting (pp. 623-627). Santa Monica, CA: Human Factors Society, Inc.