In January/February 1993, an optical visibility meter was installed in the Vaere Tunnel. Examination of printouts from this instrument shows that a Meteorological Optical Range (MOR) of less than 300 meters was recorded in extremely few cases (300 m was set as a threshold on the basis of visual evaluations in the Vaere Tunnel). This suggests that the relationship between what the visibility meter registers and what motorists experience is weak. This report proposes control values for visibility for different ventilation fan setting, based on subjective estimates of visibility in the Vaere Tunnel.


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    Title :

    Using Optical Visibility Meters in Road Tunnels: Experience from the Vaere Tunnel


    Contributors:
    T. Hedalen (author)

    Publication date :

    1995


    Size :

    27 pages



    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English





    Hvor store bør skip være/ av E. Abrahamsen

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