The National Weather Service released a dense fog advisory at 4:50 a.m. on Saturday in effect until 11 a.m. for East Bay Interior Valleys.

The NWS San Francisco CA says to be ready for, “Visibility one quarter mile or less in dense fog.”

“Low visibility could make driving conditions hazardous,” according to the NWS. “If driving, slow down, use your headlights, and leave plenty of distance ahead of you.”

Fog safety: Tips from the NWS for safe travels

When a dense fog advisory is issued for your area, it means that widespread dense fog has developed and visibility can plummet to a quarter-mile or less. These conditions pose challenges for travel, so exercise extra caution on the road or consider postponing your trip if possible.

If you must drive in foggy conditions, keep the following

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