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"Neither Autopilot nor the driver noticed the white side of the tractor trailer against a brightly lit sky, so the brake was not applied". Did the model not have a forward looking RADAR?

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No, as far as I can read, Teslas don't have LIDARs yet (but they are reported to have them, soon: http://electrek.co/2016/03/18/tesla-model-s-test-vehicle-aut...).

There is a radar, but it turns off in that situation, as Elon explained in a tweet: https://twitter.com/elonmusk/status/748625979271045121

It doesn't turn off, it just ignores things that are probably something else.

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