A fog advisory was issued for the San Francisco-Oakland Bay Bridge at about 1:55 a.m., according to CHP Officer Robert Haven.
Fog advisories were also issued for the San Rafael-Richmond, Carquinez, and Alfred Zampa Memorial bridges at about 2:20 a.m., Haven said.
Haven said that the advisories were issued because visibility was down to about 50-100 feet in some areas of the bridges because of the fog.
