Carmel, Indiana, a northern suburb of Indianapolis, likely is the Roundabout capital of the Midwest. The city has about 50 of them installed a many interchanges and is currently upgrading Keystone Ave. (former Indiana 431) into a parkway that has the dumbell roundabout interchanges at each junction. The trend is showing up up in other Indy suburbs as well, although the most famous one is the Monument Circle in the center of downtown Indy, though that is more of a traffic circle than a roundabout.