Although there is no federal law against sleeping in a vehicle, staying in your car overnight is illegal in some states and cities. Laws about sleeping legally in your car vary across states, counties, and cities.
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The policy of Walmart welcomes RVers to spend a night in their parking lot, as long as you have the individual location's permission. In some places, city zoning laws or ordinances will prohibit overnight stays in parking lots. Typically, larger cities are most likely to have these types of restrictions in place.
This number has been declining as zoning laws and city ordinances are increasingly banning overnight parking. Store managers may also not allow it. According to Walmart's website, “Permission to park is extended by individual store managers, based on availability of parking space and local laws.
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.