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In this paper, we propose a wide-area traffic signal control using predicted traffic based on real-time information. In conventional studies, the advanced methods of traffic signal control usually require the installation of detectors on all links in the network. As proposed method has an interpolation function, it can be applied to a wide-area road network that includes links on which traffic meters have been not installed. The experimental results using actual traffic data and an actual road map showed that this method is effective at making traffic flow more smoothly.