Retail and parks cover freeways in latest US urban design trend

http://featuresblogs.chicagotribune.com/theskyline/2011/10/ohio-highway-cap-at-forefront-of-urban-design-trend-retail-complex-atop-columbus-expressway-offers-m.html

Columbus, Ohio retail units are being created in a bridge over an interstate highway, continuing the traditional street. Similar schemes have been undertaken in Seattle, Boston, Phoenix and Hartford.

There is a trend to cover sunken freeways with caps, decks, land bridges or lids.

Dallas is building a three-block-long park over a freeway