[bluGill]

Autonomous cars have a lot of data gathering sensors - even if the car doesn't know something is going on, logs of what happened will greatly aid the police in their efforts to track down the criminal.

If carjacking becomes a problem the cars will figure it out and start locking all the doors. Or if the car is unoccupied, let the carjaker in, then notify the nearest police station it is coming in with a criminal.

[throwaway30yo]

You think an unoccupied car should have the ability to lock people in and take them to the police station?

[tripzilch]

Maybe in situations where someone throws a beach ball in front of your car and your immediate split-second reaction is to turn your car into a murder weapon directed at the first "hoodlum" you spot who may or may not have thrown this ball.

[bluGill]

That is a complex question. I see both sides of the issue and a lot of grey area between (I'd be shocked if I foresee even 10% of all the things philosophers will consider).

I'll just say that it is an option with some merit. Depending on the technology and the local situation I might or might not be in favor of it.