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In this study, long-term evolution patterns of inter-city travel networks were evaluated using 40 years of railway and highway travel data. The results reveal that travel demand inside and outside of the cities was widely dispersed. This finding implies that the hub cities became more prominent in inter-city travel networks. The connections between cities were centered around those hub cities. These findings implied the directions of changes in our mobility patterns, and thus helped formulate transportation and urban planning strategies at the regional level.