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Improved chain control operations.
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  • Abstract:
    In California, field maintenance personnel use turntable signs to advise motorists of chain control conditions on rural

    highways and freeways. To do this an operator has to park, exit the vehicle, turn the sign on the shoulder and then

    walk across the freeway to turn the matching sign on the median. This is repeated multiple times for chain control as

    well as for signs indicating icy or snowy conditions. Walking across highways this frequently and in these

    conditions can be hazardous to maintenance personnel.

    Caltrans staff requested a Preliminary Investigation to identify safer and more efficient state practices and tools

    being used to alert travelers to winter weather conditions. We reviewed recent research, national guidance and

    related efforts of other state DOTs to determine:

    • Tools for notifying travelers of chain control requirements and weather conditions.

    • Usage and operation of changeable, dynamic and variable message signs for winter weather notifications.

    • Operation of non-electronic signs.

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