Renzo Picasso was an Italian architect, engineer, and urban planner of the 20th century. In this blueprint from 1929, titled American Multiple Highway, Picasso proposes a stacked roadway system running along the length of Manhattan.
It was intended to have seven levels: six for automobiles and pedestrians, and one underground for the subway. As can be seen in the image, the criss-cross pattern is the intersection of the "Super Streets," three of which go from North to South and the other three from East to West. All the levels would have connected between them and with the ground by means of ramps, and to the corresponding buildings via catwalks.
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