This paper focuses on the capacity evaluation of several roundabout models, namely the turbo, flower, target and four-flyover roundabouts. Some of these layouts are innovative solutions and remain as theoretical concepts. The study followed a microscopic approach, based on the Aimsun software. A reference model of an existing conventional multilane roundabout was assembled, calibrated and validated based on field data. It was found that the performance of the turbo, flower and four-flyover roundabouts mostly depends on the directional flow of the entry traffic, especially under heavy demand. The target model presents the best performance for most of the demand scenarios analysed.

roundabout, capacity, layout, Aimsun