I've pretty much always signalled, car or bike, regardless. It doesn't cost me anything and, if I haven't noticed someone, gives them suitable warning.
As for not signalling left, it seems to me that if there's someone waitning to come out of the road you're turning into, you give them the opportunity to pull out while you'r still approaching the turn-off. Courtesy, really.
As for not signalling left, it seems to me that if there's someone waitning to come out of the road you're turning into, you give them the opportunity to pull out while you'r still approaching the turn-off. Courtesy, really.