The popular route recommendation and traffic monitoring over the road networks have become important in the location-based\nservices. The schemes to find out the congested routes were proposed by considering the number of vehicles in a road segment.\nHowever, the existing schemes do not consider the features of each road segment such as width, length, and direction in a road\nnetwork. Furthermore, the existing schemes fail to consider the average moving speed of vehicles. Therefore, they can detect the\nincorrect density routes.To overcomesuch problems,we propose a newdiscovering scheme of congested routes through the analysis\nof vehicle trajectories in a road network. The proposed scheme divides each road into segments with different width and length in a\nroad network. And then, the congested road segment is detected through the saturation degree of the road segment and the average\nmoving speed of vehicles in the road segment. Finally, we compute the final congested routes by using a clustering scheme. The\nexperimental results have shown that the proposed scheme can efficiently discover the congested routes in the different directions\nof the roads.
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