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Caltrans fog detection and warning system.
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  • Abstract:
    The California Department of Transportation (Caltrans) has implemented a fog detection and warning system on Highway 99 near Fresno. The entire central valley region is susceptible to Tule fog, which can reduce visibility tremendously, sometimes to near zero. This area has experienced numerous multiple vehicle crashes because of the fog, most recently in 2007, when a 108 car pile-up caused two deaths and nearly 40 injuries, and closed the highway for more than twelve hours. The fog detection system, which was installed last winter, uses speed and visibility detectors to assess road conditions, traffic management software to process data and control the field devices, and changeable message signs to provide information to the traveling public.

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