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dc.contributor.authorGuo, Feng
dc.contributor.authorGu, Xin
dc.contributor.authorGuo, Zhaoxia
dc.contributor.authorDong, Yucheng
dc.contributor.authorWallace, Stein William
dc.description.abstractLink travel speeds in road networks are essential data for a variety of research problems in logistics, transportation, and traffic management. Real-world link travel speeds are stochastic, and highly dependent on speeds in previous time periods and neighboring road links. To understand how link travel speeds vary over space and time, we uncover their distributions, their space- and/or time-dependent correlations, as well as partial correlations, based on link travel speed datasets from an urban road network and a freeway network. We find that more than 90% (57%) of travel speeds are normally distributed in the urban road (freeway) network, and that correlations generally decrease with increased distance in time and space. We also investigate if and how different types of road links affect marginal distributions and correlations. The results show that different road link types produce quite similar marginal distributions and correlations. Finally, we study marginal distributions and correlations in a freeway network. Except that the marginal distribution and time correlation are different from the urban road network, others are similar.en_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.titleUnderstanding the marginal distributions and correlations of link travel speeds in road networksen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.source.journalScientific Reportsen_US

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Navngivelse 4.0 Internasjonal
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