I have heard about what Californians call the "Tule Fog" for a while now, and only a few weeks ago did I experience it myself. While driving from Los Angeles to Fresno (and then to Sacramento, circling back to L.A. over the span of 4 days) there were several instances where I seriously thought that I would not get to my destination safely - the fogs were so thick I swear I was in a John Carpenter horror movie...