MoDOT and the Tower Grove Interchange

The Missouri Department of Transportation has a robust website with updates for its work around the region. Here is a link to the St. Louis area: http://www.modot.org/stlouis/major_projects/stlouiscityupdates.htm
and here is a link to the Tower Grove Interchange which will feature a roundabout:
http://www.modot.org/stlouis/major_projects/TowerGroveInterchange.htm
Here are some images of the Tower Grove Interchange plans that I found on the MoDOT web site:

The view above in of the entire project and the one below is a zoom of the roundabout.