I've seen two, this was my first, my second I need to find the people I was with, which I consider more probable since I was with 2 other people in the daytime. I just got off work and was driving home on I-80 heading west. I just passed the Wells exit and I was looking at the outline of the Sierra's in front of me, like I always do, when I saw a bright light. It was brighter than the stars, and I could tell it was in our atmosphere. I was puzzled, and I just saw Signs in the theatre a couple days before, so I might have been "seeing" things. But it was so real. I looked around the skyline to make sure it wasn't a plane or a tower or something. It just sat in the sky. I passed Virgina Street overpass and quickly looked for the object since my view was obstructed for a couple seconds, and it was still there. I was getting ready to get off at my exit, Keystone Ave, so I slowed down to stare at this bright light. Right before I exited, the object suddenly took off to the south for about 2 seconds, then disappeared. Since I was becoming paranoid, I sped home, locked myself in my apartment, checked every corner, and fell asleep 2 hours later.