It's also because people in Germany have manners. In California, or the rest of US, people just throw garbage on the side of the road. It's so infuriating! I once saw a guy throw a cigaret pack on the ground literally, and I kid you not, literally 3 feet away from a garbage can. I had to "kindly" insist that he picks it up and disposes of it properly. It's like some people here were raised by fucking wolves or something. I see people throw fast food bags, half way full drink cups, and plastic bags out of their cars on the freeway all the time.