Fail to cancel redundant indicator signals when leaving roundabouts

My complaint is about motorists, and there are a great many of them, who fail to cancel redundant indicator signals when leaving roundabouts. For example very frequently when leaving by, say, the third exit on a roundabout, they keep their right-hand indicator flashing even while making the left- hand turn to leave by the third exit.

​I find this carelessness very annoying and time-wasting when I'm looking to the right when joining roundabouts.

Peter Stock