I found that after I wrote the comment and had the same question. Also, what does "adding it" look like? Do I have to somehow interface it with the car's computer or other systems? I'm rather confused.
Adding a vehicle is the equivalent to writing drivers (heh) for your particular car. It entails reverse engineering your car's builtin driver assist features to determine which CAN messages do things like actuate the brakes and gas, turn the wheel with a given amount of torque, or communicate radar values from the cars builtin radar sensor.
For many cars the CAN messages will be the same as similar models so porting a new vehicle just means adding tuning values that can be captured by driving with OpenPilot connected but not controlling the vehicle e.g.: https://github.com/commaai/openpilot/pull/866
Wait wait wait, are you telling me I can actuate the brakes and gas and turn the steering wheel via the CAN bus? So I can realize my dream of turning my car into an RC car just with a Raspberry Pi and a $4 dongle? That is the best news of the year!
Which cars have these sorts of actuators? How can I see if mine does?
If it's not in that list then the rough heuristic is whether or not your car has some sort of existing driver assist features e.g. Adaptive Cruise Control, Lane Centering, Forward Collision Warning, etc. There are some exceptions to that rule (I think Hyundai ships some cars that have full control of steering and gas even if you don't option out the ADAS features) but that's all case by case.
If you join the Comma Discord (https://discord.comma.ai/) there are manufacturer specific channels that can answer any questions you've got.
Almost any car with drive by wire and/or modern safety features (lane assist, forward crash avoidance, etc) can be controlled (to an extent) via the CANBUS.
It’s different for (almost) every car, but you’d be amazed how easy and fun cars are to hack on, as long as you keep it off the streets.
Actually it's a horrible thing, think of it, a terrorist can buy one of these cars, install rasperrypi with internet access through mobile data, then they can terrorize the whole town by running people over without being caught or killed
Not really, all you need is a few other people in cars to block them in, problem solved. Or, if it's the US, for the police to use some of those ex-military surplus toys they have. That's not getting into remote control being imprecise so good chance the car will just get stuck somewhere.