The Single Roundabout interchange includes roundabout or traffic circle operations centered over a depressed priority roadway.

Turning traffic from the free-flow roadway is combined within the roundabout with cross street through and turning movements, as well as any frontage traffic accessing the parcels at the interchange.

The central Roundabout uses multiple entry points that can be either merge- or yield-controlled depending on volumes, number of lanes and/or central roadway radius.

The grade on the free-flow street must be short and steep to descend underneath the roundabout and ascend before the next signalized intersection, often in close proximity in an urban grid.

In addition to reducing intersection delay and queuing, the Single Roundabout interchange can handle more than four intersecting roadways and serve as a frontage road for adjacent interchange parcels.