Optimal On‑Ramp Metering of Urban Freeway Network for the Coronavirus Disease Control

  • Hongzhi LIN Southeast University
Keywords: cordon sanitaire, on-ramp control, bi-level programming model, heuristic algorithm, queuing theory


The outbreak of COVID-19 disrupted our everyday life. Many local authorities enforced a cordon sanitaire for the protection of sensitive areas. Travellers can only pass the cordon after tested. This paper aims to propose a method to design an on-ramp control scheme to maximise urban freeway network throughput with a predetermined queuing delay constraint at all off-ramps around cordon sanitaire. A bi-level programming model is formulated where the lower-level is a transportation system equilibrium to predict traffic flow, and the upper-level is onramp metering optimisation that is nonlinear programming. A stochastic queuing model is used to represent the waiting phenomenon at each off-ramp where testing is conducted, and a heuristic algorithm is designed to solve the proposed bi-level model where a method of successive averages (MSA) is adopted for the lower-level model; A genetic algorithm (GA) with elite strategy is adopted for the upper-level model. An experimental study is conducted to demonstrate the effectiveness of the proposed method and algorithm. The results show that the methods can find a good heuristic optimal solution. These methods are useful for freeway operators to determine the optimal on-ramp control for disease control and prevention.


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How to Cite
LIN H. Optimal On‑Ramp Metering of Urban Freeway Network for the Coronavirus Disease Control. Promet [Internet]. 2022Feb.18 [cited 2022Aug.11];34(1):1-12. Available from: https://traffic.fpz.hr/index.php/PROMTT/article/view/3745