Roundabout Practices (2016) / Chapter Skim
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4 States has increased in tandem with the development and publication of design guides and research (4)
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5 FIGURE 2 Location of roundabouts in the United States as of 2000. Source: Rodegerdts (2014)
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6 FIGURE 3 Location of known roundabouts in the United States as of 2013. Source: Rodegerdts (2014)
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7 FIGURE 5 Timeline of roundabouts implementation and guidance development in the United States (4)
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8 Based on the categories displayed in Table 1, each state, along with the District of Columbia, was assigned to a group. Information from the 2010 review and assignment was updated for this synthesis.
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9 Category Description None No policy or mention of roundabouts from the state DOT. Consequently, the state neither encourages nor discourages roundabouts.
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10 evaluating intersection alternatives using performance-based design. Consequently, roundabouts are being considered earlier in the project development process, alongside other intersection treatments such as all-way stop-controlled intersections, signalized intersections, alternative intersection forms, and grade-separated forms.
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11 As of the writing of this synthesis, FHWA is leading a study to update the capacity equations. The results of this research are expected to be published in 2016.
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12 FIGURE 16 Percent of drivers who support roundabouts -- Telephone surveys of Bellingham, Washington, area residents (22)
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13 Roundabouts in Corridors NCHRP Report 772: Evaluating the Performance of Roundabouts in Corridors (30) , published in 2014, studied nine roundabout corridors in the United States.
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14 FIGURE 19 Montana Department of Transportation Roundabouts website (27 )
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15 Although some states make reference to NCHRP Report 672 for design guidance, other states go further than just referring to the federal guidance and include some material in their own manual or online, such as what is found in Maryland's Roundabout Design Guidelines (41) : The Maryland State Highway Administration (SHA)
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