score:10
In Germany, there are two options that you might use:
According to the Wikipedia article, laws in Austria are very similar.
As for safety, I wouldn't worry too much, Germany and Austria are generally pretty safe places.
Upvote:7
While in Germany if you're driving in the Autobahn you can park and sleep overnight in any Raststationβ. You also have toilets in the morning, they cost about 70 eurocents.
I've already done it a few times with no problems.
Once I slept in a car parking in KΓΆln, near the river, but it is not allowed in the city. I don't remember the exact source of this information (maybe a travel guide I had with me), sorry.