Illinois Mileposts
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| Source: | Illinois State Toll Highway Authority |
| Updated: | 3/30/2013 |
| Records: | 3,488 |
This layer represents the mile marker locations for the Illinois Tollway system. Users will have access to this data layer in the side pane when a Location of Interest (LOI) is placed near a tollway. Increments are one-tenth of a mile with quarter miles included.
