由此，匝道调节率与可变速度限制间高效的联合控制对于提高道路性能显得尤为重要。

Therefore, an effective combination of ramp metering and variable speed limit control is important to achieve a good performance.

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当因交通分流导致地面道路服务水平不可接受时，采取修正调节率或者关闭匝道的措施。

Once surface street service level is (unacceptable) because of traffic diversion caused by ramp control, either the metering rate will be modified or the (on-ramp) will be closed.

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各路段根据协调控制器给定的匝道入口调节率，利用单匝道模糊控制器将系统状态保持在给定的标称点范围内。

The state of every segment on the freeway is maintained near the given rate using single ramp control method by direct controller.

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