Here's how self-driving tech stacks up for the cars currently on the road

There's been a lot of action in self-driving cars in the past two years.

In short order, we've gone from sophisticated cruise control to experimental fully self-driving vehicles to semi-autonomous systems installed on actual cars that you can buy today.

With this much going on, all at once, there are bound to be similarities and differences.

So here's a helpful rundown: