I suppose it is the English in me that makes me somewhat restrained at times.
To paraphrase Norman Lindsay's marvellous book, A Cousin from Fiji, 'as George passed by in his carriage, he did not look at those he knew. A single finger rose to acknowledge them'.
That is rather like I acknowledge a courtesy given to me on the road. I may raise my hand, perhaps nod my head, perhaps raise my finger from the steering wheel. That is how we did it in the country......does it matter? I have acknowledged the courtesy.
But this is not how the privileged yet gauche folk from Melbourne's poshest suburbs do it. No, not at all. The car window of the 4WD Audi or 4WD BMW must be down. The driver must put most of their arm out of the car and raise it high salute. If that is insufficient, the raised hand must wave about. Just in case someone has missed it, the hand will be raised again.
All for thanking someone for letting them into the traffic stream, stream being an awkward description, as it is often a non flowing stream.
I am not sure that he started it, but celebrity John Blackman was the first person I really noticed doing this and it was quite a while ago.
Unfortunately this overt gesturing is spreading and now is often used by motorists who travel along a lane blocked by parked cars to barge into a line of patient motorists who are waiting their turn. The arm goes out to thank those who had no choice to let them in, only avoid a a low speed collision. 'Oi mate, you can see I am a really out there and confident guy in an expensive car, so I have the right'.
It is a ugly, loud, very obnoxious and horribly common and I don't like it at all.