We did, but that was in 1969. We were also warned about cars with Russian plates. If we saw one, we had to call in all the information we had: type and color of vehicle, speed, direction, number of occupants, and where it was at the time we saw it.
We actually got to see one, just outside the little village we lived in. What a rush!
Yah. Our first was in 1997. It was eerie to drive from Germany to France straight on through an abandoned checkpost. It almost looked like something from a wild west movie... trash and tumbleweeds (or European equivalent) blowing though the place...