Optimisation of motorway operations via ramp metering and variable speed limits |
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Authors: | Ying Li |
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Institution: | Centre for Transport Studies, University College London, London, UK |
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Abstract: | This paper presents a modelling and optimisation framework for deriving ramp metering and variable speed control strategies. We formulate the optimal control problems aiming to minimise the travel delay on motorways based upon a macroscopic cell transmission model of traffic. The optimal ramp metering optimisation is formulated as a linear programming (LP) while the variable speed control problem is formulated as a mixed integer LP. The optimisation models are applied to a real scenario over a section of M25 motorway in the UK. This paper also includes various analyses on the sensitivity of the optimal control solutions with respect to different network configurations and model assumptions. |
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Keywords: | cell transmission model mixed integer linear programming ramp metering variable speed limits |
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