[jyl]

The human not noticing, is easy. He may have been dozing, reading the paper, surfing the web.

The car not noticing, is weird. I can see the autopilot being programmed to disregard bridges and overpasses, but the truck was low enough to take off the top of the car, so it wasn't that high off the ground, and obviously it's wheels would have been at ground level.

I don't think this should be an unanticipated situation . . . a large vehicle turning in front of the car seems pretty foreseeable.

Seems there have been many reports of the Tesla autopilot doing scary things, entering curves way too fast etc. I don't think the autopilot can possibly have been thoroughly tested in autonomous mode, look at how long Google has been testing its self driving cars. Has Tesla been reckless in enabling and advertising Autopilot?.