Waymo Via
I competed in the DARPA Urban Challenge, back in 2007.  While we were watching the finalists trying to sort out the world's first fully-automated traffic jam, the conversation turned to how easy it is to manipulate these vehicles.Imagine a remote stretch of highway frequented by automated 18-wheelers.  All that's required to bring the truck to a screeching halt is a bedsheet and some decent timing, at which point the vehicle has no way to prevent a robbery.  The truck could put in a remote distress call, but it will still be some time before a human can get there.  It's a new era for railroad heists!We're no closer to solving this problem than in 2007; everybody is still trying to manage the long tail of merely safe driving.  Handling humans in adversarial situations like the above is still completely off the map.