For those of you unfamiliar with the area, this is the intersection of US Highway 30 and Iowa Highway 1. Plenty of east-west traffic on 30, and north-south traffic on 1 (in and out of Iowa City).
The DOT would have preferred building a bypass/interchange further south, but the property owners and businesses in Mt. Vernon pitched a fit. Hence, a roundabout.
Not entirely the case. The bypass has been on and off the DOT 5-year plan for since the 80's. It is now back on the plan and the area residents and businesses are warming to the idea. Unfortunately, when the bypass is eventually built (funded), the town will have a very expensive roundabout(s). Many here are upset with the cost of the project however there was some grant money available (maybe the tail wagging the dog here). Combine that with lack of experience and you can generate a pretty good controversy in town. Traffic is flowing much more smoothly since it opened. I have not witnessed any stippers yet, however they would be welcome...maybe not in the center of the roundabout though as that might cause even more issues.
"Keep Calm and Drive On"