Abstract
There are many examples of roundabouts with unbalanced flow patterns in Australia, where part-time roundabout metering signals are used to create gaps in the circulating stream in order to solve the problem of excessive queuing and delays at approaches affected by highly directional flows. The use of metering signals is a cost-effective measure to avoid the need for a fully-signalized intersection treatment. A case study is presented comparing a roundabout with and without metering signals in terms of operating cost, fuel consumption and pollutant emissions as well as delay and degree of saturation. (Author/publisher) For the covering entry of this conference, please see ITRD abstract no. E214755.