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>There's a few large truck trailers I've seen completely covered on a side with a picture which could be interpreted as a road / sidewalk / smaller car / whatever.

Truck trailers are typically 3-4 ft off the ground, and have obvious borders.

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They're obvious to you and me - are they obvious to a camera only Tesla "autopilot"?

Are you prepared to try that the "obvious border" is enough? Would you fully trust that there will be no issue?

I'm prepared to trust that the obvious border, the fact the trailer is 3-4 feet off the ground (thereby creating obvious visual separation), and the fact that I've never seen a deceptively painted trailer, that this isn't worth worrying about. I'd be far more worried about it not being able to recognize off-ramps, or "activists" vandalizing it as a political statement.

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