Perhaps there is a different term for the type of city you are thinking of, generally cities such as Letchworth[1] are moreso what is known as a garden city.
Letchworth is a Garden City. Brasilia is a "towers in a park" type Modernist city. You're interested in "towers in a park."
Historically, cities like Brasilia were designed around the logic of the car. For example, most roadway intersections feature over and underpasses, cars are completely segregated from pedestrians. By most accounts, it doesn't work so well.