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The research showed that one can characterize the quality of global traffic in a city at each time in the day using percolation threshold, see Fig. 1.
In recent articles, percolation theory has been applied to study traffic congestion in a city. The quality of the global traffic in a city at a given time is by a single parameter, the percolation critical threshold. The critical threshold represents the velocity below which one can travel in a large fraction of city network. The method is able to identify repetitive traffic bottlenecks.
<ref>{{Cite journal|last1=Li|first1=Daqing|last2=Fu|first2=Bowen|last3=Wang|first3=Yunpeng|last4=Lu|first4=Guangquan|last5=Berezin|first5=Yehiel|last6=Stanley|first6=H. Eugene|last7=Havlin|first7=Shlomo|date=2015-01-20|title=Percolation transition in dynamical traffic network with evolving critical bottlenecks|journal=Proceedings of the National Academy of Sciences|language=en|volume=112|issue=3|pages=669–672|doi=10.1073/pnas.1419185112|issn=0027-8424|pmid=25552558|bibcode=2015PNAS..112..669L|pmc=4311803|doi-access=free}}</ref>
Critical exponents characterizing the cluster size distribution of good traffic are similar to those of percolation theory.<ref>Switch between critical percolation modes in city traffic dynamics,
G Zeng, D Li, S Guo, L Gao, Z Gao, HE Stanley, S Havlin,
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