业务层还控制着可变速度标识，车道结束标志和许多可变信息标志。

The operational layer controls also variable speed signs, lane closing symbols and variable message signs.

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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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阐述了神经网络学习算法，设计了高速公路可变速度标志神经网络控制器，并对控制器进行了仿真研究。

The neural network algorithm is formulated and the controller is designed. Simulation research is carried out by taking full advantage of a computer.

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