One of the criticisms of self-driving cars is that they may be open to remote control by the authorities or crackers. (They definitely *will* by the latter, since existing cars have already been hacked. I mean purpose-built interfaces for slaving the car to a different set of controls.) Watching fire trucks try to navigate through the city this evening, I came to the conclusion that the way this will be marketed to the public is as a public safety measure to allow emergency vehicles to get through traffic more easily (instead of using a local-control model that does not involve handing over control.) So watch for that, I guess.