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Roundabouts in the United States (2007) / Chapter Skim
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From page 1...
... S U M M A R Y Based on the findings of this study, roundabouts appear to be successful in a wide variety of environments in the United States. The following sections summarize the major conclusions from this study.
From page 2...
... 2Because driver behavior appears to be the largest variable affecting roundabout performance, calibration of the models to account for local driver behavior and changes in driver experience over time is highly recommended to produce accurate capacity estimates. The exponential model parameters can be calibrated using locally measured parameters as follows: where c = entry capacity (pcu/h)
From page 3...
... in FHWA's Roundabouts: An Informational Guide. These findings should be considered interim until a more comprehensive study of sight distance needs at roundabouts can be completed.

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