Legality. “According to the Highway Code, it is not a problem if you stay in your own car,” explains the lawyer Jörg Elsner, chairman of the Association of Traffic Law in the German Bar Association (DAV). A ban does not exist on sleeping in the car.
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Most people with a love of air and nature will understand that in a densely populated country like Germany, natural areas need special protection. Animals and plants urgently need the little space we still allow them. Nature reserves and national parks are therefore absolutely taboo for any overnight adventure.
If you are the driver in charge of the vehicle it is illegal to sleep in it 'on the public highway' this includes laybys! Even if you take keys out of ignition, sit/lie in a place that is obviously not the driving seat, it is still not legal.