Human settlements usually do not exceed a couple of miles in diameter, for a pedestrian life style. A person can only deal with distances around a mile or two for daily activity. Modern cities are designed for a species called cars. Humans walking in these cities would be so alien and awkward.
Modern cities tend to have means for effective transport called public transit. I have lived in two big city centers and now live in one of their suburbs and I have never felt the need to own a car, even though I do have a driving license. Moving around is as easy as hopping onto a tram, metro, train or bus. In special cases there's always a possibility to call a ride.
It's still more car-centric than it should be here - it's absurd how much space we waste on all these parked cars around - but fortunately it's been improving over time.
