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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