I've only been a passenger, and only in the later 1990s. I was in high school back then.
Once was in a Fiat motorhome, (five in the tree) that couldn't go any faster than 70 mph. The family we rode with lived in the Stuttgart area, and we went as far north as Leipzig. I remember crossing what used to be the border between East Germany and West Germany; if it weren't for a sign announcing the fact and our travel companions mentioning it, we'd never have known it used to be such a sharp divide in such recent times. The driver told us that, back before the wall came down, he once drove into East Germany, and crossing the border took about 48 hours—including removing the seats during vehicle search.
The other time was in a Renault minivan, for only about 100 miles or less to/from Rottweil. I remember my mom thinking we were going awfully fast, and she asked me to look at the speedometer. After some quick mental math, I replied that we were going 99 mph. The driver said he preferred to never go faster than 160 km/h because his tires were only rated up to that speed.
I do remember when that first driver missed a turn while we were on our way between two towns. I mentioned to my parents, "I think we just missed our turn back there". She told the driver, and he asked, "How do you know?" And, of course, she answered, "Because my son said we did." You might be a roadgeek if...