No doubt its illegal, but on this one I have to say I prefer to get past as quickly as possible. On an overtaking lane, I will push it up to maybe 120, because I want to allow the other cars behind me to also have an opportunity to overtake whatever is in the slow lane. Of course, if nothing is going under the limit then I dont feel the need to overtake at all.
Stuck behind a B-double, going along a winding single lane highway at 70, first chance I get a safe shot at it I will overtake. Because its a winding single lane highway, my priority will not be the speed limit, it will be getting safely back onto the correct side of the road as soon as possible, for both my own and the truck drivers safety.
I cannot safely assume that any oncoming traffic is travelling at the speed limit, so what I think is a reasonable amount of distance I can see ahead is not necessarily so if someone crests the rise 1km ahead at 200kmh.
I believe it is safer to get past as quickly as possible, and return to my own side of the road as quickly as possible. I'd be happy to argue that in court too, although of course I would lose. Its a major flaw in road laws in my view.
I'm not advocating anyone else doing the same, but in this case I believe the law is wrong, and I wouldnt mind a chance to fight it in court some day, just on principle.