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Discussion Starter · #1 ·
I am going to show an example: anhangabau valley in são paulo, early 90's
http://www.skyscrapercity.com/showthread.php?t=372649

before the refurbishment:

http://fuscaclassic.blogspot.com.br/2010/12/vw-no-vale-do-anhangabau.html

the building with a garden on the top is the são paulo's city hall
beside cha viaduct crossing the valley

by negro

up this picture, we can see the south entrance of tunnels and below, the north entrance of tunnels

by negro

south entrance of tunnels

by negro

north entrance of tunnels
santa efigenia viaduct and mirante do vale building the black glass tall building

by negro

do you know another example?
 

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Journeyman
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Seattle is building a 9,000-foot tunnel through the center of town to replace a waterfront viaduct, a short tunnel, and three blocks of surface divided highway that comprise highway 99. The pit is being dug now for the tunnel boring machine. But there will be surface streets everywhere they already exist, perhaps with a covered spot or two that will probably be fairly narrow bridges rather than real covers. The tunnel itself will largely go deep underground with no surface representation.

We've put lids over several freeways. In addition to the current Highway 99 tunnel, we've lidded part of I-5 in the center of town, substantial pieces of I-90 in Seattle and on Mercer Island, and, currently underway, a short bit of Highway 520 on the far side of Lake Washington. Additional lids are planned for a rebuilt 520 within Seattle as phase 2 of a project that's currently in phase 1.
 

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Journeyman
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This is a better map than the one on the front page of that link. http://www.wsdot.wa.gov/Projects/SR99/Tunnel/PojectMap.htm

Regarding the current viaduct along Elliott Bay, here is what's envisioned for that stretch. It's early...construction would be after the tunnel is done and the viaduct goes away, starting in 2016. Basically an expanded surface roadway and a fair amount of new public space. (The tunnel will only be close to a portion of this at the south end.) http://waterfrontseattle.org/downloads/Waterfront_Seattle_Design_Summary_July2012.pdf
 
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