Munich has covered most of its inner city beltway: http://www.muenchen.de/sehenswuerdigkeiten/orte/120326.html

The article is in german, see before-after visualizations at the bottom of the article under "So soll es bald aussehen: Vorher - Nachher".

Current status is that traffic runs through the tunnel. Above ground, work is in progress to make things look like in the visualization. I might go and take some photos of what it currently looks like if anyone's interested.