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Fig 1.

Freeway weave section with on/off ramp schematic diagram.

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Fig 2.

Flow chart of PSO-PID control system.

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Fig 3.

Layout of Youren Interchange.

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Table 1.

Traffic flow at Changyi Freeway.

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Fig 4.

The actual flow variation input of upstream.

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Fig 5.

The expected density diagram.

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Fig 6.

Density variation under PSO-PID control.

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Fig 7.

The curve of ramp metering.

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Fig 8.

Density variation under BP-PID control.

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