Roundabout Practices (2016) / Chapter Skim
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Pages 26-31
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From page 26... ...
26 alternative, or a DOT employee at headquarters or a regional office champions the roundabout alternative. In Georgia, a roundabout can be dismissed from consideration without a preliminary scaled aerial sketch to analyze a roundabout's potential impacts.
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27 Minnesota DOT (MnDOT) has modified several roundabouts from their original design.
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28 As mentioned in the questionnaire summary, most states use a 20-year design life for their roundabout analyses, and many states, including Georgia and Maryland, will open the roundabout as a single-lane roundabout if that configuration is expected to be sufficient for approximately 10 years. Another factor, as the ConnDOT respondent pointed out, is the uncertainty with current forecasting methods.
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From page 29... ...
29 Oversize/overweight vehicles, including vehicles such as low-boys with low vertical clearance, are only used as design vehicles on certain state highways with special freight needs. Most of the states interviewed use four-inch truck aprons adjacent to the central island, but some of the state agencies are considering lower height truck aprons to accommodate vehicles with low vertical clearance.
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From page 30... ...
30 Both of these low-cost implementations were delivered in less time that a typical roundabout project, which entails a rigorous review process. These projects also yielded a high rate of return on investment.
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From page 31... ...
31 California Roundabouts have been being built in California since the early 1990s. Over the past decade roundabouts were primarily considered through the Caltrans safety program.
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