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Jie, L. (author), Van Zuylen, H.J. (author), Chunhua, L. (author), Shoufeng, L. (author)The travel time is an important measure for the quality of traffic. This paper discusses a few methods to measure or estimate the travel time in urban road networks. First of all, it is important to know that urban travel times display a large variation, so that the measurement of a single (average) travel time is not so meaningful. The travel...journal article 2011