Within-day travel speed pattern unsupervised classification——A data driven case study of the State of Alabama during the COVID-19 pandemic  

作　　者：Niloufar Shirani-bidabadi Rui Ma Michael Anderson 

机构地区：[1]Connecticut Transportation Institute,University of Connecticut,Storrs-Mansfield,CT 06269,USA [2]Department of Civil and Environmental Engineering,University of Alabama in Huntsville,Huntsuille,AL 35899,USA

出　　处：《Journal of Traffic and Transportation Engineering(English Edition)》2021年第2期170-185,共16页交通运输工程学报（英文版）

基　　金：supported by New Faculty Award from UAH’s Office of the Vice President for Research and Economic Development.

摘　　要：Recent comparative studies on mobility patterns are emerging to describe the changes in mobility patterns due to the COVID-19 pandemic.Most of the current studies utilize travel volume per day as the critical indicator and identify the impacted period by the dates of governmental lockdown or stay-at-home orders,which however may not accurately present the actual impacted dates.The objective of this study is to provide an alternative perspective to identify the normal and pandemic-influenced daily traffic patterns.Instead of only using traffic volumes per day or assuming the impacted travel pattern began with the stay-at-home order,the methodology in this study investigates the within-day timedependent travel speed as time series,and then applies dynamic time warping algorithm and hierarchical clustering unsupervised classification methods to classify days into various groups without assuming a start date for any group.Using the state-wide travel speed data in Alabama,these study measures dissimilarities among within-day travel speed time series.By incorporating the dissimilarities/distance matrix,various agglomerative hierarchical clustering(AHC)methods(average,complete,Ward’s)are tested to conduct proper unsupervised classification.The Ward’s AHC classification results show that within-day travel speed pattern in Alabama shifted more than two weeks before the issuance of the State stay-at-home order.The results further show that a new travel speed pattern appears at the end of stay-at-home order,which is different from either the normal pattern before the pandemic or the initial pandemic-influenced pattern,which leads to a conclusion that a’new normal’within-day travel pattern emerges.

关 键 词：COVID-19 Within-day traffic dynamics Dynamic time warping Hierarchical clustering Unsupervised classification 

分 类 号：U116[交通运输工程]