Yup they're everywhere, but how many have checked the legislation? Not many, I bet... which is why I called Qld Transport before fitting mine...
The farmers I can understand, they would spend a lot of time on their own property and wouldn't worry too much about fitting extra lights on the roof for driving around said property - but the people in towns would have seen the farmers and thought they looked "cool" and gone from there.. bet not many of them bothered to check the legality of it.
Sheep / mob mentality - "he did so I must be able to do it"

