本文指出要有效解决高速公路的交通拥挤与堵塞问题，必须研究入口匝道控制、主线控制、通道控制等的集成问题。
This paper points out that the integrated problem of entrance on ramp control, mainline control and corridor control must be studied in order to solve traffic jam of freeway effectively.
但是当高速公路严重拥挤时，匝道控制不再有效，需结合主线可变限速控制，以缓解交通拥挤。
When the traffic demand is too high that ramp metering is not effective anymore, the variable speed limit control is needed to relieve the congestion.
但是当高速公路严重拥挤时，匝道控制不再有效，需结合主线可变限速控制，以缓解交通拥挤。
When the traffic demand is too high that ramp metering is not effective anymore, the variable speed limit control is needed to relieve the congestion.
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