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The Illinois Department of Transportation has a long and rich tradition in
mapping and cartography. The department started roadway map production in the
early 1910s and now prepares and distributes over 2,000 maps including the
Illinois Official Highway Map, 102 County Maps, 18 Supplemental Maps, 112
Township Maps, and 1200 City Maps. These maps provide the base for a multitude
of other informational maps detailing such items as traffic and roadway
functional classification.
The department routinely distributes map updates to state agencies, local
agencies, libraries, mapping companies and the general public.
The department has developed maps around three broad aspects: content, the
information the map contains such as highways, railroads, waterways; style, the
manner in which information is portrayed such as line weights, symbology, and
text fonts and sizes; and geometry, the principles of measurement which govern
the location of all geographical points on the map.
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