Self driving cars have very complex goal metrics, along the lines of getting to the destination while disrupting the traffic the least (still grossly oversimplifying).
The manufacturer is interested in every one of his cars getting to the destination in the least time, so the cars are programmed to optimize for the sake of all cars. They're also interested in getting human drivers to buy their cars, which also makes not driving like a jerk a goal. PD is problematic when agents are selfish, not when agents entirely share the goal. Think of 2 people in PD played for money, who both want to donate all proceeds to same charity. This changes the payoffs to the point where it's not PD any more.
Depends on who those humans are. For a large fraction of low-IQ young males...They're also interested in getting human drivers to buy their cars, which also makes not driving like a jerk a goal.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.