Oregon has a safety law that says you can't pump your own gasoline. I'm sure glad, because every day you hear about another explosion or fire at a station in one of those other states that let untrained people pump gas.
Wait - when was the last time I heard about something like that happening? I can't even remember right off hand of one that wasn't intentional.
Just because there is a law about something, it doesn't mean that it's because it happens. Often, legislation is proposed and passed because of the fear of something that might theoretically happen, but that in real life, doesn't happen, or is so rare that it's statistically insignificant.
Plenty of people travel with the fridge on propane and have no issue at all. Have issues happened? Yes. How many times out of how many total incidents of successful travel with the propane on? Most likely, not significant enough to justify the legislation.
Is it wise in some situations to shut it off? I can see a justification for some long tunnels, perhaps ferries, but on the average road?
