Until some of these potential tools are developed we are faced with mostly subjective judgments of the adequacy of visual environments and severely limited budgets with which to attempt to meet all needs. This paper is a review of the driver's information needs and some of the considerations which may be helpful in meeting them within the confines of practical programs. The EIDAC model is used to remind designers and traffic engineers that users are diverse and most are different in their needs compared to the people who typically attempt to provide for these needs. Observers who are not familiar with an area are better able to judge the users' needs, and if possible, lay volunteers should be included on site visits in which delineation adequacy is under study. The unusual or rare need may still be a highly legitimate one in terms of accident prevention. In most cases, the information system designer must consider all five aspects of the EIDAC model: expectancy shaping, information provision, decision processes, action requirements, and confirmatory information after an action. Some examples of novel and possible visual information sources have also been discussed. (Author)

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    • Presented at the Symposium on Conspicuity on the Highway, St. Paul, Minnesota, 24-26 June 1980. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
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    Transportation Research Board

    500 Fifth Street, NW
    Washington, DC  United States  20001
  • Authors:
    • Olsen, R A
  • Publication Date: 1981-5

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  • Features: References;
  • Pagination: p. 10-14
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Filing Info

  • Accession Number: 00335156
  • Record Type: Publication
  • Report/Paper Numbers: HS-032 445
  • Files: HSL, TRIS, TRB
  • Created Date: Oct 28 1981 12:00AM