United States Department of Transportation
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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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