Caltrans reminds drivers that, in the fall and winter, the lower foothills and Valley areas are plagued by extremely dense fog which poses a severe driving hazard. Despite the predictability of the seasonal fog, multi-vehicle accidents are commonplace, due to the combination of fog, excessive speed, and traffic congestion. To alert drivers to fog hazard, Caltrans has installed a number of automated warning signs along southbound Interstate 5 and westbound Hwy 120. The signs are equipped with monitors which will detect foggy conditions and slow or stopped traffic, and transmit an appropriate warning to drivers. While Caltrans is committed to enhancing safety on state highways, drivers on all highways are reminded to take necessary precautions by adjusting your speed and driving habits for poor visibility conditions, and to allow plenty of time to get to your destination.