Last week when we rented a car, we realized that we didn't know very much about German road signs. And although most of them don't have any words on them, we still couldn't always understand them.
It took us a while to figure out that this sign, for example, means no passing. It was especially difficult to interpret because we most often saw it on a divided autobahn with two or three lanes and no apparent reason that one shouldn't pass. (And it seemed to be frequently ignored in those circumstances.)
This sign also perplexed us. It means the end of any speed limit, and we decided we knew what it meant when all the cars around us immediately increased their speed by at least twenty kilometers.
All in all, we did a fairly good job. No accidents, not even any close calls, and my honey had fun driving fast. Still, if I rented a car in a foreign country again, I would do some homework ahead of time. After all, isn't that what the world wide spidernet is for?