Parking and sleeping spotsHere you can stay and sleep in a van or any car, in any public parking, paid or free, for a maximum of three days. There is a law for that. We've heard all kind of rumors and people saying either it is allowed or illegal.
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7 Places You Can Park Overnight & Sleep On A Road Trip
The ZTLs are zones of restricted circulation, situated in Italian cities that have historic centres. Only the local residents and registered vehicles are authorised to drive there.
Answer. The easy answer to this question is that you will never run out of air. You will just exchange the breath that you breathe in with the breath that you breathe out.
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.