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Roundabouts and Access Management.
| 题名： | Roundabouts and Access Management. |
| 作者： | Alluri, P.; Cavaretta, A.; Elefteriadou, L.; Gan, A.; Lytle, B.; Michalaka, D.; Rachmat, S.; Steiner, R. L.; Washburn, S.; Xu, R. |
| 关键词： | Access Management; Bicyclists; Capacity; Computer Software; Florida; Intersections; Multimodal Transportation Systems; Pedestrians; Roundabouts; Traffic Safety; Transportation Planning |
| 摘要： | Transportation engineers and planners are becoming more interested in using roundabouts to address access management and safety concerns in the transportation system. While roundabouts are being used increasingly in a variety of contexts, existing research does not provide detailed guidance on how to evaluate the use of roundabouts as a form of access management. This Florida Department of Transportation (FDOT) research project has three primary components: a review and assessment of national and state guidance related to roundabouts and access management, a safety analysis of all 283 roundabouts in Florida, and an operational analysis of selected roundabouts. Literature related to safety, access management, and multimodal transportation (especially for bicyclists and pedestrians, and roadway capacity associated with the use of roundabouts) is reviewed, and gaps in knowledge regarding the use of roundabouts are identified, particularly as they apply to safety, access, and capacity. One of the findings of the literature review is that little research has been completed on access management near roundabouts. A review of national and state guidance identifies major studies including NCHRP 672 and guidance in Kansas, Wisconsin and Virginia that recommend intersection and driveway spacing similar to that recommended for unsignalized intersections. The safety and operational analysis identifies four areas of concern: corner clearance, including stopping site distance (SSD) and intersection sight distance (ISD); the need for guidance on the functional area near roundabouts including driveway and intersection spacing, and the use of medians; access to major activity centers; and safety of vulnerable road users, especially bicyclists and pedestrians. The operational analysis confirms previous research that shows that roundabouts are similar to un-signalized intersections, but the differences may influence the operations and safety within the functional area of the roundabout |
| 报告类型： | 科技报告 |
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