Because in a lot of situations you are not alone on the road and you have to negotiate with other cars or people and decide what to do. There are a lot of single lane streets which can be passed in both directions and the car has sonehow have to deal with the incoming var on who should drive first or who drives backwards.

Meh, again, I don't know why software that's never having a bad day, never frustrated, is trained to drive defensively, and has the actual highway code programmed in to it will struggle more than Pedro will, especially given that if the other car is also autonomous then they can actually negotiate.