Yes, Americans can drive rental cars in Germany, but you must be at least 18 years old and hold a valid U.S. driver's license. While German law technically recognizes valid U.S. licenses for up to six months, many rental agencies and the "Polizei" (police) strongly recommend—and sometimes require—an International Driving Permit (IDP). The IDP acts as an official translation of your license and is essential if you are pulled over or involved in an accident. You can obtain an IDP from AAA for about $20 before you leave the States. Additionally, be aware that many German rental cars have manual transmissions; if you can only drive an automatic, you must specify this and pay a premium. Driving on the Autobahn is a highlight for many, but remember that the "no speed limit" only applies to certain sections, and the left lane is strictly for passing—staying there too long can result in a heavy fine.