I was driving through the back roads of Arkansas around 3am. Suddenly I hit a dense fog bank. It was so thick that I knew I should have pulled off the road because I could barely see in front of me, but sometimes pulling over can be just as dangerous. So I slow to about 20mph and put my hazards on. I see no other cars coming from the other way or behind me. After about 15 minutes I start seeing humanoid shadows illuminated by my headlights darting around the sides of the road and across it. It made the hairs on the back of my neck stand up. I saw maybe 5 or six of them. Never got a good look, all I saw was shadows darting back and forth but they we definatly human shaped. Needless to say I was freaked out and wanted to get away. I speed up a bit and after about 5 minutes I came out of the fog bank. It ended just as suddenly as it came. I speed away at my allotted 65mph and didn't stop till the sun came up.