... 可变限速标志||variable speed-limit sign 可变限速控制||variable speed-limit control 可变向车道||reversible lane ...
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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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