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Not signalling turns is something that I really don't understand. It requires minimal effort, doesn't slow you down in any way, and significantly increases safety. It's something that should be enforced much more.

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There’s a significant fraction of drivers that interpret a turn signal as a sign that it’s ok to pass unsafely because the signalling driver is safety-conscious and will act to avoid a colission,

These people are mentally unfit to take part in motorised traffic. Confiscate their driving licence and return it only when they undergo and pass a psychological examination.

It looks like Tesla AI doesn't take the signals into account, but only the car movements.

I’ve heard the argument described like this:

Indicating I’d exactly that: indicating your intention to turn, which is useless information because it causes people to assume they know what you will do.

It’s not an entirely flawed argument.

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