I find that a minority, when hearing that, instinctively take a step left before realizing that they need to move to the right.

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[–] 3 points 2 days ago

I kinda wonder how useful it is but I think the main thing is any warning and its kinda nice to know where it might be. I get you though. You don't see them coming and so its kinda out of the blue and they are moving fast so by the time it even registers for me they have basically passed. Maybe everyone should just put a playing card in their spokes :)

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