See, in theory that sounds fantastic and makes complete sense. In reality unless you have x-ray vision and can see through the car to the indicator on the opposite side, it is redundant. For obvious reasons indicators are not designed to be seen from the opposite side of a vehicle
The right indicator blinking or the lack of a right indicator blinking and your speed are what really lets other drivers know what is happening, not the redundant flick of the left indicator when you're already clearly on the way off the round about anyway. You can't start it earlier otherwise you are going to get people from the first intersection pulling out in front of you, and then in the case of cars when your wheels are to the right the left indicator won't stay on because the auto off mechanism is in the wrong position almost every time, until your wheels are straightening and it's clear you are leaving the roundabout anyway.
It is a useless rule for all but the absolutely massive of roundabouts.
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