Some of the most egregious roundabouts I've ran (heh) into have been in Aspen. They're right after you get off 70 (ie going 65/70 mph) and are often overgrown with bushes and trees. I'm all for roundabouts, I think when done right they're great, but I don't know what they were thinking when putting these in.

https://www.google.com/maps/@39.6439352,-106.3776606,248m/da... (2008 footage) https://www.google.com/maps/@39.6277372,-106.4200775,185m/da...