This is in effect the whole Courbousien 'streets in the sky' ideal, where terra firma becomes the abode of cars and people walk around on walkways above, ultimately
becoming a second layer of street. The City of London (the Square Mile financial district) tried unsuccessfully to implement such a plan in the 1970s, leading to the absolute
mazes around the Barbican centre, and walkways to nowhere ending in blank walls when the scheme was finally abandoned. To access the brutalist centre (arts, gardens,
millionaire apartments, concert hall, Museum of London) the easiest way is to actually walk through the traffic tunnel they once thought would only be for cars. The crowd of
people all doing the same thing shows the failure of the scheme.
a web of coloured lines were later installed to help people head to the different destinations, as without them there were no landmarks whatsoever.
A more up to date scheme is the Sliced Porosity block in Chengdu
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though it still has porousness with the world outside via steps down to street level
www.stevenholl.com
Also Linked Hybrid in Beijing by the same architects
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www.mimoa.eu