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It is strange that if it is the case of driver-inattention-disengagement, that the Tesla wouldn't at least put on hazard lights. Maybe it wouldn't be enough in this situation, but in most cases, it would be a more obvious signal that the left lane change is an emergency maneuver.

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I haven’t looked at my tail lights, but in the US most cars have used the same bulb for hazard and brake. So the bulbs are already fully illuminated.

Cars meant for the rest of the world have separate yellow lights in back and you could flash those. I think they are adding a rapid burst flash for alert with those.

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