Evaluating the Performance of Corridors with Roundabouts (2014) / Chapter Skim
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Evaluating the Performance of Corridors with Roundabouts Page S-1 SUMMARY EVALUATING THE PERFORMANCE OF CORRIDORS WITH ROUNDABOUTS This study identified 58 roundabout corridors in the United States in 2011. There is diversity among these corridors in terms of length, roundabout spacing, number of lanes, surrounding land use, previous control (if not a new facility)
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Evaluating the Performance of Corridors with Roundabouts Page S-2 added over time. The variety of motivations for considering roundabouts, the variety of levels of interaction with the public, and the design treatments ultimately constructed reinforce the notion that each corridor is a unique installation.
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Evaluating the Performance of Corridors with Roundabouts Page S-3 and does not explicitly account for certain aributes of roundabout corridors such as geometric delay of a through movement at a roundabout. The four models specifically developed for roundabout corridors as part of this research are: A free flow speed model, which estimates the speed that most drivers would choose at mid segment locations beyond the extent of the roundabout influence areas when other vehicles are not present.
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Evaluating the Performance of Corridors with Roundabouts Page S-4 Corridors that can use two way stop controlled intersections (rather than signals) in the place of roundabouts generally produce be er end to end travel times, even if intersection delays are lower under a roundabout configuration.
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Evaluating the Performance of Corridors with Roundabouts Page S-5 The CCD provides a broad approach for helping to inform corridor solution concepts by enabling case specific comparisons and evaluations. The CCD is flexible to adapt to the broad range of potential catalysts that might be the impetus for a particular project.
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