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Iowa DOT backs 2x1 roundabout for Willis Avenue at Highway 141; Perry to update RISE application
Summary
City staff, consultants and Iowa DOT presented alternatives for the Willis Avenue–Highway 141 intersection and recommended a 2x1 roundabout for safety and operations; the council will update its RISE grant resolution for DOT review and could start design if funding is approved.
PERRY — City staff, a consultant team and Iowa Department of Transportation engineers on Thursday told the Perry City Council that the agency’s preferred fix for the Willis Avenue–Highway 141 intersection is a two-lane-to-one-lane (2x1) roundabout, based on safety and traffic forecasts.
Consultant Jennifer McCoy, a senior traffic engineer with Bolton and Inc., told the council that the intersection currently has a high share of angle crashes: "over 50% of our crashes at the intersection are broadside or angle type crashes," and nearly half of recorded crashes there have resulted in injury. She said study modeling that included two near-term developments (JBS and ADR) and a conservative 50% growth projection for the industrial park showed the existing two-way-stop control would degrade to Level of Service F in the near term without changes.
The consultant team analyzed three alternatives: a conventional traffic signal with turn lanes, a multi-lane (2x1) roundabout and a reduced‑conflict intersection (RCI or J‑turn). McCoy summarized the tradeoffs: the signal would meet MUTCD warrants and…
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