The first idea is pro-people and pro-city.  What is good about this idea is that improvement can creep in as the parked automobile creeps out, it works incrementally and at a minor expense per increment.  Once in place, it can be moved, shuffled and changed – and of course expanded.

The second idea is pro-machine and anti-city. What is especially bad about this is that in order to start working a significant portion of it has to be in place at once, and at great expense. And once in place, it will be a blight for decades and extraordinarily hard to dismantle, once AVs become smarter.  This idea assumes a very limited understanding of the AV.