**Reference:**

A. Hegyi,
B. De Schutter, and
H. Hellendoorn,
"Model predictive control for optimal coordination of ramp metering
and variable speed limits," *Transportation Research Part C*,
vol. 13, no. 3, pp. 185-209, June 2005.

**Abstract:**

This paper discusses the optimal coordination of variable speed limits
and ramp metering in a freeway traffic network, where the objective of
the control is to minimize the total time that vehicles spend in the
network. Coordinated freeway traffic control is a new development
where the control problem is to find the combination of control
measures that results in the best network performance. This problem is
solved by model predictive control, where the macroscopic traffic flow
model METANET is used as the prediction model. We extend this model
with a model for dynamic speed limits and for mainstream origins. This
approach results in a predictive coordinated control approach where
variable speed limits can prevent a traffic breakdown and maintain a
higher outflow even when ramp metering is unable to prevent congestion
(e.g., because of an on-ramp queue constraint). The use of dynamic
speed limits significantly reduces congestion and results in a lower
total time spent. Since the primary effect of the speed limits is the
limitation of the main-stream flow, a comparison is made with the case
where the speed limits are replaced by main-stream metering. The
resulting performances are comparable. Since the range of flows that
main-stream metering and dynamic speed limits can control is
different, it is concluded that the choice between the two should be
primarily based on the traffic demands.

Online version of the paper

Corresponding technical report: pdf file (790 KB)

@article{HegDeS:03-016,

author={A. Hegyi and B. {D}e Schutter and H. Hellendoorn},

title={Model predictive control for optimal coordination of ramp metering and variable speed limits},

journal={Transportation Research Part C},

volume={13},

number={3},

pages={185--209},

month=jun,

year={2005},

doi={10.1016/j.trc.2004.08.001}

}

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