https://www.abc15.com/news/arizona-police-investigating-self-driving-uber-car-involved-in-crash-overnight
Apparently there was a driver in the car, but it was in autopilot mode. I have to wonder what kind of systems might be in place in these vehicles to alert the driver in the case of an imminent emergency? If the car knows (which it may not have in this case) that it will have to slow down significantly, might it make a loud beep or something to warn the driver?