One other thing on driving in Germany - when I went to pick up my rental and showed them my US driver's license, they didn't believe it was a driver's license. It was a new design from the State of New Hampshire. I never realized that NOWHERE on my license or my wife's did it actually say "Driver's License". It has "OPR" in big letters, indicating it's a normal operator's license (as opposed to a CDL or something). Finally, on the back, I found a signature and underneath it text saying "Director of Motor Vehicles" and they took THAT as 'proof' that it was a license.