Probably watching porn on the DVD player 
I wonder if his hands were on the wheel at the time of the crash

If he has whiplash, i'd love to see him explain that one on the claims form

He was cleary distracted away from the road, to have not intervened, but was killed by the fact that the trailer didn't have underrun protection... roof was sliced off as the car passed underneath it...
Technical detail here (no gore)...
https://youtu.be/s8AHzY7xr10Had this crash happened with a european trailer, then the driver would still be alive. Not the fault of the car, but rather an unfortunate combination of circumstances. He should have taken evasive action upon seeing the truck, but I suspect that he was waiting to see how the car responded. That the car didn't react is down to the timing of the incident... Tesla blame the truck colour and sunlight rendering the truck near invisible, add in the 25-30' gap under the trailer with nothing for the car to pick up, and you can see how it happened...
A couple of his videos showing the capability of the cars autopilot...
A 12 hour trip in timelapse
https://youtu.be/Z8G4N89ESWYCar defends itself from a crappy lane change:
https://youtu.be/y4bQBJ2CfqkAutopilot in town, listen to what he says, and also read notes on video... :
https://youtu.be/69zCIxuxTj0As a strong advocate of the Tesla, and it's capabilities, it is possible that he had become complacent or overconfident of it... a shame then that his death will be remembered for his mistake rather than for the underlying safety omission of underrun protection on trucks...
