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This paper presents a novel system to collect traffic data using the user feedback via mobile phone. The devices can work like the distributed human-sensors in conjunction with the cellular-based and GPS-based sensor which can collect the traffic information to the traffic report server. The congestion degrees explicitly reported by the user can be instantaneously used. Cellular-based and GPS-based data can be used alone to estimate traffic congestion conditions using congestion estimation algorithms, or can be used to cross check with the congestion degrees provided by the cell phone users.
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