Historic traffic volume maps for Chicago, Illinois Department of Transportation District 1 and north Cook, south Cook, DuPage, Kane, Kendall, Lake, McHenry, and Will counties.
State of Illinois highway maps from 1917 until today
Historic GIS shapefiles containing traffic volumes for the years starting in 1996 can be downloaded from IDOT 's T2 Center.
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Historic traffic data
Historic traffic volume maps for Chicago, Illinois Department of Transportation District 1 and north Cook, south Cook, DuPage, Kane, Kendall, Lake, McHenry, and Will counties.
State of Illinois highway maps from 1917 until today
Historic GIS shapefiles containing traffic volumes for the years starting in 1996 can be downloaded from IDOT 's T2 Center.