Leading New York transport advocate Paul Steely White says they will also be social places where all road users - including pedestrians and cyclists - move around easily and safely.
There will be more pedestrian plazas, play streets, bike and bus lanes, 30km/h speed zones, street vendors, pedestrian lighting, trees and gardens.
As a result, Mr White says, there will be fewer injured road users and more profitable shops.
Mr White, who spoke at an RAC breakfast forum in Perth yesterday, said the "complete street" of the future was taking shape in several US cities, including New York, Chicago and San Francisco.
Balance at the West Australian online.