Possible means of giving advanced warning to driver of motor vehicles during periods of fog are examined. To date only limited amounts of data have been collected due to lack of fog which could be considered detrimental to driver performance. Partial testing of variable speed limit signs at one site indicates that for low to moderate traffic volumes in daylight fog conditions, speeds are reduced by the fog approximately 5 mph and that posting of a reduced speed limit will further reduce vehicle speeds another 5 mph. The reduced speeds were still generally higher than the stopping distance for the 200-foot visibility condition observed. Posted speeds also produced better grouping of speeds about the mean speed (i.e., lower variance). The amount of very short headways were reduced. Work is continuing on several other methods of providing additional warning to drivers; however, no data are available at this time. These methods can be classified into four general categories: (1) Roadway and signing; (2) Patrol activity; (3) Public information; (4) Vehicle and equipment.


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    Titel :

    Reduced Visibility (Fog) Study


    Beteiligte:
    R. N. Schwab (Autor:in)

    Erscheinungsdatum :

    1965


    Format / Umfang :

    60 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch





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