Roundabouts may be particularly advantageous for:
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In this sketch, the city's consultants used abnormally large roundabouts. The outside diameter of the each roundabout is about 230 ft. Size matters with roundabouts and smaller is generally better. In practice the actual size of each roundabout is more accurately represented by the area shaded in green, or between 150 and 190 ft maximum diameter.
A Double Roundabout at the "5-Points" Intersection
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This amateur sketch demonstrates that two modern roundabouts of modest size will essentially fit within the two existing signalized intersections. Roundabouts are a great solution at intersections where right of way constraints exist, where there are a high number of left turning movements, and where business access is a consideration. Professional analysis and design is required to accurately model the performance of roundabouts for a particular location. The results of the generic model evaluated by the city's consultants, while encouraging, are misleading because it will always under-perform a properly designed solution.