User:Hawkeygoal/IL Pages/IL RoadNaming(2016 11)

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Revision as of 04:50, 20 November 2016 by Hawkeygoal (talk | contribs)


The goal of this page update is add additional guidance on the handling of elevation relative to overpasses in Illinois by revising the Major roads section of the Illinois wiki.

This information is under consideration for the Illinois state wiki.
It should not be considered official guidance.


US, State, and County Route Naming

The following naming conventions are used in Illinois for US, State, and County route naming.

US Highways Illinois-US66-Shield.png
US Highways (or routes) are named in Illinois using the standard US Road Naming guidelines. The base format of the name for these road types is:

US-66 For U.S. Route 66

State Highways (Routes) Illinois-IL23-Shield.png
Illinois state highways are named as follows:

SR-23 For Illinois Route 23
SR-23 S For Illinois Route 23, Southbound
SR-23 BUS For Illinois Route 23 Business (note BUS must be in uppercase)
SR-23 BUS N For Illinois Route 23 Business, Northbound (note BUS must be in uppercase)
SR-23 ALT For Illinois Route 23 Alternate
SR-23 ALT S For Illinois Route 23 Alternate, Southbound

County Highways Illinois-PerryCH4-Shield.png
County highways in Illinois are named with a "CH" prefix as illustrated below:

CH-4 For County Highway 4
CH-4 S For County Highway 4, Southbound
Where Counties have highway designations beginning with a letter, the format looks like this:
CH-T4 For County Highway T4
CH-T4 E For County Highway T4, Eastbound

County Roads Rural counties in Illinois employ a geographic coordinate system to name roads outside established communities. These roads are prefixed with a "CR." These names employ a number and a cardinal direction, general north (N) or east (E) of a specified locus. For example:

CR-1000E Refers to county road 1000E
CR-3000N Refers to county road 3000N

Township Roads A select few counties employ township roads. Please consult with the state managers before editing names of township roads.