“Future city streets will be in four levels,” says Mr. Corbett, architect, in Popular Science Monthly in 1925. “The top level for pedestrians, the next lower level for slow motor traffic, the next for fast motor traffic and the lowest for electric trains. Great blocks of terraced skyscrapers half a mile high will house offices, schools, homes and playgrounds in successive levels, while the roofs will be aircraft landing-fields.”

See the full infographic at Retronaut.

Source: Guardian.co.uk

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