It doesn't seem like he was being dangerous.
I can see a dangerous argument if there were drivers coming up fast and risking it - but my reading of it suggests he was observant, driving to a speed he felt comfortable with and made sure traffic could pass.
He pushed it too far though - signing off that he wouldn't do it again as he would have his licence cancelled - and then doing it again, would have been better and cheaper for him to simply sell off and get a more efficient vehicle...
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