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New Footage Shows Tesla On Autopilot Crashing Into Police Car After Alerting Driver 150 Times
(www.carscoops.com)
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If you're swerving to avoid a sudden obstacle you reasonably may not have the foresight or reaction to flip on a signal. The car still needs to not force you back on collision course.
That's a good point, and is probably why they designed it so that if you swerve hard, lane assist shuts off. It only nudges you back to the middle of the lane if you are gently drifting to a side, so it only works in situations where your turn signal can be used to avoid it. Or you can just disable it if you drive a BMW or otherwise can't use turn signals.