Therefore, an effective combination of ramp metering and variable speed limit control is important to achieve a good performance.
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。
It has four start mode: the ramp voltage start, the limit current start, the ramp speed start and the discrete frequency start.
所研究的软起动器具备四种起动方式：电压斜坡起动、限流起动、转速斜坡起动和分级变频起动。
In this paper, we carefully analyze the characteristics of density limit disruptions during current ramp-up, flattop and ramp down phases.
本文详细分析了出现在电流上升段，坪段及下降段密度极限破裂的特征。
Industry officials say a number of factors limit their ability to quickly ramp up production in those areas.
业内人士表示，有诸多因素限制了石油公司在获准开采地区增加产量的能力。
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。
Study shows that, these methods of the on-ramp control and the main variable speed-limit control can effectively relieve the highway peak traffic congestion.
研究表明，通过高速公路入口匝道调节控制以及主线可变限速控制，能够有效缓解高速公路高峰期交通拥挤状况。
Study shows that, these methods of the on-ramp control and the main variable speed-limit control can effectively relieve the highway peak traffic congestion.
研究表明，通过高速公路入口匝道调节控制以及主线可变限速控制，能够有效缓解高速公路高峰期交通拥挤状况。
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