This brochure offers tips for winter driving on California's highways, "to reduce the number of fog-related accidents." The brochure focuses on the low-lying fog where a "dramatic change in visibility and the speed of traffic can lead to multiple-car pileups." The brochure also describes current safety technologies, including changeable message signs, visibility sensors, and visibility signs. Opens directly in to a PDF file. From the California Department of Transportation (Caltrans) and California Highway Patrol (CHP).