Circa 2025. An autonomous BMW sedan with a passenger slows down near a crossing in LA. It has sensed an elderly couple on the pavement waiting to cross the road. A couple of minutes pass by, and both parties remain static. The couple — who is actually waiting for their son to pick them up — has no clue why the driverless car has come to a halt in front of them. They gesture the car to go ahead even as the passenger fumes in the backseat. But the vehicle has "machine learned" to be polite and careful.
It does not have an alternative course of behavior, unlike the resourceful Jeeves in a PG Wodehouse novel.