The present study was designed to evaluate validity aspects of the eye movement method and the recall method used frequently in studies concerning perception of road signs. One problem of the eye movement method is that drivers are alerted because they know they are participating in an experiment. Therefore they may behave differently from unalerted drivers. The first experiment was designed to compare speed changes of 77 alerted and 311 unalerted drivers while encountering a road sign. Three conditions were evaluated: a game crossing sign, a speed limit sign, and a control condition with no sign. The results indicated that in the speed limit condition, the alerted drivers reduced their speed more than did the unalerted drivers. In addition, the variance of speed of the unalerted drivers was always more substantial than the variance of the alerted drivers. Two problems of the recall method are the delay between the passing of the sign and the inquiry, and the anxiety caused by a sudden request to stop. 102 subjects encountered the same stimulus conditions. Either immediately after passing a road sign or 670 m downstream, the subjects were asked a question about the last road sign. The results showed that subjects recalled the speed limit sign regardless of the delay, but the recall of the game crossing sign decreased substantially when the inquiry was delayed.


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    Title :

    Evaluations of Validity of Two Research Methods for Studying Perception of Road Signs


    Contributors:
    J. Luoma (author)

    Publication date :

    1991


    Size :

    34 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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