Something like that happened to a Tesla, here.[1] The Tesla is the car in front in the left lane, not the one taking the pictures with a dashcam. There's a construction barrier that's inconsistent with the lane lines. The Tesla plowed into the barrier.

This shows why the Tesla approach isn't good enough. The vehicle is on a freeway, an supported environment for the old "Autopilot". Everything is going just fine. Until there's something unexpected the system can't handle, appearing fast enough that the driver couldn't take over in time.

Tesla is somewhere between Level 2 and Level 3. Good enough that the driver is tempted to tune out, not good enough that they can.

[1] http://video.dailymail.co.uk/video/mol/2017/03/02/5177969943...