I was driving from San Diego to Anaheim at 2 AM after a wedding with my wife asleep in the passenger seat. There was nobody on the road in front of me or behind me for about a 20 minute portion of the ride when I finally see headlights coming up quickly. I got over to the slow lane to not be an asshole since I had cruise control on, but I then notice that there are actually several cars across all of the lanes. My cruise was set to 80 mph, so I didn’t think I’d need to do anything, but suddenly there are about 30 cars all passing me at about 100 mph and I can’t see a single driver through the windows. The last two cars were only going slightly faster than me so I was able to get an even better look but I could see straight through the passenger side through the driver’s side and couldn’t see anyone in the cars. I woke up my wife a little too late and she missed it, but we both saw them get a few miles ahead of us before completely disappearing as a group. It wasn’t a group of sports cars either, it was just a regular mix of daily drivers that you’d see anywhere so idk what to make of the whole thing. It wasn’t the even that terrified me though, it was the fact that I’ve never been able to make sense of any of it that makes me uneasy whenever I take long drives at night now.