I don't think driving without a seat belt is all that sensible. Other things happen besides collisions with other cars.
Friend of mine was doing the same thing on a property in WA when they hit a very large pot hole.
He bounced out of the seat, his head hit the roof resulting in 5 crushed/cracked vertebrae and he now has a spine full of titanium screws and has been told that it is likely that he will never be pain free.
He is sure sorry he wasn't wearing his seat belt on private property.
Not preaching but just relating some genuine experience.
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