From the Portal Germany Blog 
It might be a good idea to read this post about the German Autobahn. You may be surprised at some of the laws. For instance, did you know that if you are traveling at over 130kph, and you get in an accident, your insurance company may not cover the damages?  Read the blog article

• It is illegal to stop on shoulders or run out of gas.

• Passing on the right is illegal on all German roads.