To legally drive in Germany as a U.S. citizen, you primarily need your valid U.S. Driver's License and a valid passport. While German law officially recognizes U.S. licenses for short-term stays (up to six months), it is highly recommended and sometimes required by rental car companies to also carry an International Driving Permit (IDP). The IDP acts as a certified translation of your license and can prevent legal headaches if you are pulled over by police who may not speak fluent English. You can obtain an IDP from AAA in the U.S. for a small fee before you depart. Additionally, if you are driving your own vehicle (or a long-term lease), you must carry proof of insurance (the "Green Card"), a warning triangle, a first-aid kit, and a reflective safety vest, as these are mandatory safety items in all German vehicles. In 2026, be aware of "Environmental Zones" (Umweltzonen) in many German cities, which require your vehicle to display a specific emissions sticker (Feinstaubplakette) to enter the city center without being fined.