Why don't we signal on roundabouts only when exiting, as drivers do in Austria?

While in Austria earlier this year I was told that on roundabouts, the rule is that one only gives a signal just before exiting. This strikes me as quite sensible, as one assumes the motorist is carrying on all the way round. What do you think? Should it be adopted here?

Asked on 28 December 2013 by WL, Milton Keynes

Answered by Honest John
The trouble is that Brits often left-signal their intention to leave the roundabout too early. That's why a right-signal can help to tell other drivers what you are doing until the point you left-signal to leave the roundabout.
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