Date of this Version
Report # UNL: SPR-1(07) P598 Final Report WBS: 26-1118-0085-001
This research deals with two related issues: investigation and mitigation of roundabout elements that lead to driver confusion, and development of a flexible criteria matrix by which the Nebraska Department of Roads (NDOR) can evaluate arterial intersections to identify good candidates for conversion to roundabouts. The use of modern roundabouts along arterial roadways is relatively new in Nebraska. The first urban arterial roundabout was opened to traffic in June of 2002 at the intersection of 33rd and Sheridan Blvd in the City of Lincoln. Citizens and some professionals were somewhat skeptical of the capability of this roundabout to improve traffic delay and safety. However, after the construction of this roundabout the City of Lincoln has reported reduced traffic delays and the Nebraska Department of Roads (NDOR) has reported a reduction in traffic accidents. The objectives of the research include: (1) identification of user issues and confusing elements of roundabouts via surveys and development of mitigation measures for safer usage of arterial roundabouts in Nebraska; and (2) development of a criteria matrix for arterial intersections that NDOR can use to check the candidacy of intersections for conversion to single-or multi-lane roundabouts.