Sergio Venegas points to a display of images along a 12-mile stretch of California's Highway 99 south of Fresno. An intricate system of 12 cameras, 33 electronic message signs and 41 microwave sensors installed along the dangerous corridor has worked to help avert deadly pileups during dense tule fog. AP photo
In this file photo from Dec. 19, 2001, smoke rises from vehicles that were involved in a multi-car accident in dense fog on southbound Highway 99 in Elk Grove. Three people were killed and the freeway was closed in both directions for several hours. AP file photo

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