In the past few mornings and evenings, drivers across the Central Coast may have experienced patches of dense fog, making it difficult to see clearly.
The California Highway Patrol says people should treat fog the same as rain or darkness.
Officers say drivers need to slow down and keep distance between cars to give themselves more time to react.
"If the speed limit being 65, and whether it's heavy fog, rain, anything of that nature that would, again, impair your visibility, you can be stopped and ultimately cited for driving at an unsafe speed,” said Mike Poelking with CHP.
Officers say it's also important to keep your headlights and tail lights on.
They advise against using high beams in the fog.