Optimising total entry delay at roundabouts with unbalanced flow: A dynamic strategy for smart metering
Journal article, 2019

Modern roundabouts are widely used at intersections with light traffic, generally providing safety and other advantages. However, large entry delays are often observed at roundabouts with unbalanced flow patterns, even though the entry traffic flow is not high. A metering signal-based strategy is examined to mitigate the above problems. A mathematical optimisation model is formulated firstly with the objective of minimising the total entry delay, subject to the metering signal thresholds. Then a solution algorithm based on VISSIM simulation is developed. Finally, a case study is carried out to testify the feasibility and applicability of the proposed model. Extended scenarios analyses under different levels of approach volume, different demand combinations and different proportions of right-turn vehicles (left-side driving) are also conducted. Results show that the methodology can effectively improve the operational performance, and a delay reduction of up to 25.7% can.

Delay reduction


Traffic control


Yuzhou Duan

Henan University of Technology

Xiaobo Qu

Chalmers, Architecture and Civil Engineering, GeoEngineering

Said Easa

Ryerson University

Yadan Yan

Zhengzhou University

IET Intelligent Transport Systems

1751-956X (ISSN) 1751-9578 (eISSN)

Vol. 13 3 485-494

Subject Categories

Transport Systems and Logistics

Vehicle Engineering

Control Engineering



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Latest update

4/8/2019 1