Improved multi-lane roundabout designs for urban areas

This research, undertaken 2008-2010, investigated the comparative safety of multi-lane roundabouts versus signalised intersections, pedestrian facilities, vertical deflection devices and visibility to the right. Guidance for practical application of the relevant measures to enhance roundabout safety has been developed and is included in this document. The Dutch turbo-roundabout was reviewed and considered to be feasible for application in New Zealand. For intersections with four arms or more, a well-designed multi-lane roundabout should be significantly safer for vehicle users than traffic signals. Several means of adequately catering for pedestrians and cyclists at multi-lane roundabouts are feasible to implement in many cases. In the interest of road safety, a 'Roundabouts First' policy is recommended for adoption by the NZTA. The legal use of flashing signal displays and part-time signal operation are also recommended for consideration, which would potentially allow for 'Pelican' type pedestrian crossing installations, and also for signalised roundabouts to operate with less vehicle delay during off-peak periods.