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Indicating is to indicate your intention, you should indicate whether there's someone in your blind spot or not. Otherwise you wait or slow down until your blind spot is clear or something and nobody around you has any idea what you're doing.
PhilDAS-
Highway code
Rule 133
If you need to change lane, first use your mirrors and if necessary take a quick sideways glance to make sure you will not force another road user to change course or speed. When it is safe to do so, signal to indicate your intentions to other road users and when clear, move over.If there is someone along side you in your blind spot it isn't safe so you shouldn't indicate.
jellybaby
I don't know but maybe. Maybe an academic or safety regulator has a study somewhere. It feels a bit like you might start indicating to trigger the camera and check your blind spot which is a bit frightening to anyone that is in that spot at that time (which they shouldn't linger in etc).
On the other hand perhaps it increases the chances of people indicating which some drivers seem to think is unnecessary.