Understanding the marginal distributions and correlations of link travel speeds in road networks.

Scientific Reports
Feng GuoStein W Wallace

Abstract

Link 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.

References

Dec 22, 2012·Scientific Reports·Pu WangMarta C González
Mar 16, 2016·Nature Communications·Serdar ÇolakMarta C González
Jul 9, 2016·Science·Nataša Pržulj, Noël Malod-Dognin
Sep 30, 2016·Proceedings of the National Academy of Sciences of the United States of America·James D FordLivia Bizikova
Apr 7, 2017·Nature·Andrew Kusiak
Jan 11, 2019·Scientific Reports·Aldenor G SantosJailson B de Andrade
May 18, 2019·Scientific Data·Feng GuoZhaoxia Guo

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Software Mentioned

Caltrans Performance Measurement System ( PeMS
Getis
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