Bosch, the world’s largest automotive supplier (and also a Udacity Self-Driving Car partner) has published a neat Automated Mobility Academy that describes different levels of autonomous driving and key features at each level.
It’s basically a web series, free and targeted at the general public, that describes different parts of the autonomous vehicle ecosystem.
The stages are: Driver Assistance, Partially Automated Driving, Conditional and Highly Automated Driving, and Fully Automated Driving. These pages correspond roughly to Levels 2 through 5 of the SAE autonomy levels.
This is a much lighter treatment of autonomous vehicles than the Udacity Self-Driving Car Engineer Nanodegree Program, but it’s short and concise and accessible to the general public.
If you’re interested in learning a little bit about how self-driving cars work, you should check it out!