In Auckland motorbikes can use the in city bus lanes .. so got no questions there .. but I'm unsure if when I'm in one of those bus lanes and stopped at traffic lights, do I have to go when when the white "B" lights up ?  Or wait for the green ?

I'm pretty sure I can't go through on the "B" I'm under the impression that is the buses only "go" .. any one know ?

The reason I ask is I had an aggro bus driver tooting his horn for me to go on the "B" ... not sure if I was right to wait for the main green or if I accidentally slowed him down 5 seconds :)