Performance Analysis of the Dowling Multi-Lane Roundabouts, in Anchorage, Alaska
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2010-06-01
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By Lee, Ming
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Abstract:The first multi-lane roundabouts in Alaska were constructed in 2004 at the ramp terminals of the Dowling/New Seward Highway interchange in Anchorage. The Dowling roundabouts are currently operating at capacity for a short period of time during the evening peak hours. The Dowling Road roundabouts offer a unique opportunity for traffic engineers to study the operating capacity of multi-lane roundabouts in the US. In addition, the safety performance of these multi-lane roundabouts has not been examined either. This study was designed to measure the operating performance and safety performance of the multi-lane roundabouts. We studied the operation of the roundabouts in both summer and winter operating conditions.
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