It is much more effective to repeat an action all the time so that it does not require thought. If it is "automatic" to signal when you turn, you do it. The split second it takes to decide whether you 'need" to use a signal is a split second you can more safely be concentrating on driving. A small thing perhaps, but the split second can be lifesaving.
Where I live half the year, way south, drivers treat red lights the same way they treat stop signs. You stop and if no one seems to be around, you go ( and I do not mean just on right turns).
The issue with the turn signals is not " who is right" and why you were stopped. It is just safer to do it automatiically.
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