Idot Traffic Count Map

Traffic counts for previous 2 years are updated to the current year using factors based on traffic growth of counted sites statewide. Both types of county maps are issued at two scales: Rural secondary, or county roads functionally classified as major collector.

Tcmap enables users to search, pan and zoom to areas throughout the state to view aadts,. You can analyze and combine datasets using maps, as well as develop new web and mobile applications. 1) the general county highway maps and 2) the county traffic maps.

The two inventories below detail the illinois state library’s holdings of two types of the illinois department of transportation’s (idot), or its predecessors maps:

Idot district 1 maps are now posted on the cmap data hub. Historic gis shapefiles containing traffic volumes for the years starting in 1996 can be downloaded from idot 's t2 center. If you have a need for 2020 traffic data and understand the samples were taken during the pandemic with decreased traffic, please use the contact information below to make your request. These counts were adjusted in an attempt to minimize the effects of monthly volume variations.