Cars can go “quickly” between cities and towns but around pedestrians they really do need to slow down.
I wouldn’t want to live anywhere where the car is king and everyone else must cede to its ultimate priority.
People need to give themselves more time to get places, rather than thinking they are far more important than the greatly decreased safety of others.
The American mindset is not. I swear that a huge portion of people in the US have been propagandized to believe that the car is king and that any idea to the contrary is heresy punishable by death under the front bumper of a Ford F-250 jacked up 3 feet higher.
https://bicycledutch.wordpress.com/2012/01/02/sustainable-sa...
https://swov.nl/system/files/publication-downloads/dv3_en_ko... (pdf)
As I understand it, this vision does not compute. The number of movements of people in a dense city is too large for everyone to move in a car, autonomous or not. Cars take a lot of space. They need to stop someplace for someone to get in and out, merge in and out of traffic. Streets cant be designed in a way that accomodates this at the scale of a city like NY.
Similarly, in spread-out suburbia, autonomous cars would still get stuck in traffic jams if everyone has to use them to get to work. Making cars autonomous makes things a bit more efficient, but not by orders of magnitude.
Mass transit, combined with walking and biking, is simply way more efficient for moving people in cities and is a proven model that does scale.
Urban design talks about street vs road. You can have places for vehicles to zoom about in (roads), and you can have places with shops and businesses and homes for people to use (streets), but you shouldn't try to make the same place serve as both. So in cities and town centres you need to prioritise pedestrians and cyclists: low (and enforced!) speed limits, narrow streets that naturally reduce speed, car-free zones. It doesn't need radical new development, you just need to break the assumption that cars are entitled to go full speed everywhere and everyone else has to deal.
If we go back to lower speeds then maybe it could be manageable in a same way.
But as it is actually used now for 3000 pound vehicles to zoom about in, it makes no sense for pedestrians to be intersecting and sharing the space at all. Just due to the physics of collisions between a person and a vehicle. I don't think slow vehicles is a good solution because we do need to get places.
I think an actual good (but very expensive) solution is for new cities to be designed differently in several ways. One of which is for roads to be be autonomous vehicles and entirely separate from pedestrian paths. To make that reasonably practical you need some other core assumptions to be changed. And also a totally new development probably.