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Happens regularly with all versions of Autopilot. Here's a recent one with a Tesla Model 3: https://youtu.be/X3hrKnv0dPQ https://youtu.be/X3hrKnv0dPQ

• WA 6y ago
  I wonder why this can even happen. Tesla cars have some kind of radar for front distance, no?
  • oldgradstudent 6y ago
    Reportedly[1], radar cannot reliably distinguish between trucks blocking the road, manhole covers, overhead signs, overpasses, and a lot of other stuff. If the car stops for every radar returns that looks like something that blocks the lane, it will perform emergency brakes for ghosts all the time. The Tesla (and others) do is to ignore returns from stationary objects in certain circumstances. [1] https://www.wired.com/story/tesla-autopilot-why-crash-radar/ https://www.wired.com/story/tesla-autopilot-why-crash-radar/
    • m463 6y ago
      Thinking about how radar works - it would be easier to detect a slow moving car than a stopped one. In other words, driving at 50 mph and coming up on a car going 10 mph, you would get two strong signals -- one strong one for the world going -50mph, and a smaller one for a car going -40 mph. A stationary vehicle however - it would be indistinguishable from everything else that is stopped.
      • LeoPanthera 6y ago
        The "autopilot" on my Nissan Leaf explicitly warns you, in big, red text, that it cannot detect stopped cars if you are driving faster than 30mph. As long as they're moving, even slowly, it has no problems.