Fog advisories were issued this morning for the San Mateo, the Golden Gate Bridge and the Bay Bridge. The alert is effective until 9 a.m., but could extend until 10 am as the thick fog lingers.

According to BCN, "On other Bay Area bridges and roads, foggy conditions are affecting visibility." Also, don't use your brights. Just use your regular headlights (even during the sunny hours) so that other drivers can see.