The National Weather Service has issued a Dense Fog Advisory for the Northern San Joaquin Valley (which includes western Calaveras and Tuolumne counties), until 10 AM this morning.
Locations include: Valley Springs, Stockton, Oakdale and Modesto.
A Dense Fog Advisory means visibilities are frequently reduced to less than one quarter mile. If driving, slow down, use your low-beam headlights and leave plenty of distance ahead of you.
Additionally, for the latest highway work zones and mountain driving restrictions, click http://www.mymotherlode.com/traffic