Many cities have public transit in the form of busses and/or subway systems, but regular street traffic still exists and car ownership has so much cultural inertia that it’ll probably take decades to wean people off of them.

However, that doesn’t mean we should refuse to improve cars in the meantime just because they’re not the transport solution we’d prefer.

I remember watching a video showing how increased reaction speed can virtually eliminate traffic jams (I believe it was this one?). It’d require nearly all vehicles to be automated, but someday city traffic might flow smoothly even during the busiest of rush hours.