“…Besides, Figure 7 suggests that around 15km is the typical human radius of "jump" (or called "displacement" (Noulas et al, 2012)) in new cities as it takes about 15 to 30 minutes to drive such distance (by bus, taxi, or subway). Obviously, this distance is far smaller than 100km, the typical human radius of "reach" traveled from home (Mok et al, 2010;Cho et al, 2011), mainly due to different trip purposes and functional zoning (Dubrova et al, 2015) in various cities. Hence, the factor (distance) may not be a critical (or even an appropriate) variable to model universal patterns of human movements, which is consistent with the results of a few previous studies (Song et al, 2010;Noulas et al, 2012;Gallotti et al, 2016;Wu et al, 2014;Liu et al, 2014;Liang et al, 2015;Zhao et al, 2016a).…”