They modify a car to use extended hands on sticks as indicators. There was three; 'turning left', 'turning right' and one in the middle that was 'turning nasty' [this hand was the old English two-finger flip off].
As to the topic I have a few minor gripes:
I do wish more motorcycle riders were careful in motorway traffic when going between lanes then zipping in and out. On a related note I've seen a few motorcycles use the new somewhat protected bicycle lanes on Kirkbride road in Mangere, is that legitimate?