The analysis of Performance and Capacity at a Roundabout with metering signals

Abstract

This paper aims to describe a method for the analyzing of capacity and performance of roundabout operating with metering signals. The use of metering signals is a found as a measure to avoid the need of a fully signalized intersection, when the low capacity conditions are observed during peak demand flow periods. Roundabout metering signals are often installed on selected roundabout approaches and used on a part time basis, since they are required, when heavy demand conditions occur during peak periods. These metering signals are used normally for alleviating the excessive delay and queues, due to the gaps created in the circulating stream. The basic principles of the operation of roundabout metering signals shall be explained. This paper shall present some analysis results, when operating with metering signals. A case study for some crucial roundabouts in Albania, shall be part of the results and conclusions must be considered to reevaluate the need, when to use metering signals, or not, at the existing congested roundabouts.