Requirements for owning a car in Germany include:
International driving licences are valid for six months. Before this time is up, you must apply for a German licence at the local "Ordnungsamt".
Here is a list of traffic signs in Germany with an explanation in English published by the ADAC ("Allgemeiner Deutscher Auto Club", German Automobile Club). Other important rules to remember are:
Cycling is much loved in Germany, both as a means of transport and for bicycle tours (Ger. "Fahrradtour"). There are many cycling lanes in cities and in the countryside, for example along rivers. All traffic laws must be adhered to and bicycles have to comply with technical specifications (brakes, lights, etc). Children are usually taught the rules in primary school and are given a licence!