Use signals properly, use lanes properly, do it all. And who on earth would trust a turn signal in any situation? They can mean nothing. They are for letting cars behind you know you why you are slowing. In roundabouts, they are for saying to those entering that you are continuing and so they definitely should not enter. - They should not enter in any case until you are past, but this gives them an extra reason not to do so. - Of course if your signal indicates you are exiting rather than continuing, those seeking to enter should not trust that. But it does let anyone behind you know your reason for slowing - its to exit. They may be less likely to ram you from behind if they expect slowing
So...signals always serve good safety purposes but never should be taken as "I'm definitely going to do this."
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