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讨论了交通流诱导系统的交通流量、行程时间和行程速度的采集技术，提出了一种改进的牌照识别法，该方法适合于交通流密集路段上的交通数据采集。
The traffic flow, travel time and travel speed acquisition technology of traffic flow guidance system are discussed. An improved license plate recognition method is proposed. This method is suitable for traffic data acquisition on traffic flow intensive sections.