My celeb traffic sighting was last year near Detroit, near Southgate, MI, I was at a light, looked to my right, saw a sweet Mercedes with what appeared to be 20's on it, I looked in the window, and I see Ivan "Pudge" Rodriguez from the Detroit Tigers. He was apparently trying to stay incognito, hat pulled down low, sunglasses, and he was kinda hunkered down low in the seat. I honked, motioned for him to roll his window down, and to my surprise, he did, I told him I was a big fan, and it's great to see a great player like him playing for my home team. He said thanks, and we went on our way.
Other than that, I never considered these guys 'celebs' but I'd see University of Michigan athletes and coaches all the time when I was in downtown Ann Arbor. I guess I just never considered them celebs cuz the athletes, some of them were guys I had hung out with before and knew them as just normal guys even though they were big names around town to most everyone else.