Marco Arment:
A few Tesla vehicles have had accidents with Autopilot enabled recently, and I’ve gotten countless questions about these incidents and the nature of Autopilot from people who aren’t Tesla owners. Tesla and the media haven’t clearly communicated what these features do (and don’t do) to the public, so I’ll try to help in whatever small way I can as a Model S owner for a few months so far.
I found this quite helpful in understanding more about the component parts of what Telsa’s ‘Autopilot’ will do (or not do) for you.