Comparative Analysis of Peanut Roundabouts and All-Way Stop Intersections

Level of Education of Students Involved


Faculty Sponsor

Jay Grossman




Civil Engineering

Presentation Type

Poster Presentation

Symposium Date

Spring 4-27-2023


Peanut roundabouts, also known as dogbone roundabouts or dumbbell roundabouts, are a type of roundabout that has two roundabout segments connected by a narrow "waist" in the middle, resembling the shape of a peanut. They are typically applied in locations with challenging topography or right-of-way restrictions, precluding the use of a traditional circular roundabout. As a typical roundabout, peanut roundabouts are designed to accommodate higher traffic volumes and reduce traffic congestion by allowing traffic to flow continuously in a circular pattern without the need of signalized control. Peanut roundabouts are becoming more commonly used where efficient use of space is required. This study presents a comparative analysis of the delays at a planned peanut roundabout compared to an all-way stop controlled intersection in Elkhart County, Indiana. This comparative analysis is based on data collected using a micro-simulation model of the existing stop-controlled intersection and proposed peanut roundabout. The study tracked the difference in vehicle delay between these two intersections and in an effort to identify the factors that influence the associated delays. The findings of this study have practical implications for transportation planners and engineers, as the results provide insights into the factors that affect delays at these types of intersections, which can be used to improve transportation infrastructure and design on future intersection projects.

Biographical Information about Author(s)

Carly Schiene is a junior civil engineering major who took an interest in transportation on campus and has been involved in multiple undergraduate research projects for the past year.

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