User:Hawkeygoal/IL Pages/IL Dirt Roads (2016 06)

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Revision as of 19:11, 14 December 2016 by Hawkeygoal (talk | contribs)


The goal of this page update is to clarify handling of the dirt road type in Illinois by revising the Special roads section of the Illinois wiki.

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

The recent correction of the "dirt" road type to "off-road / not maintained," we are advancing this modification to the Illinois guidance on dirt and gravel roads within the state. This guidance is intended to codify what falls into the "not maintained" category while providing for future inclusion of the, as yet unimplemented, "unpaved" checkbox.


Non-Drivable Roads

 |   |   |   |   | Walking Trails |   |   |   |   |  and  |  |  |  |  | Pedestrian Boardwalks |  |  |  |  |  are not added to the map in Illinois. Outside some special exceptions, these road types do not add to the routing function of the application.

Special exceptions may be made with the approval by State Managers. For example, a  |  |  |  |  | Boardwalk |  |  |  |  |  may be used to support house numbers in situations where they are not assigned to drivable road types. This use must be approved by a State Manager (refer to Area Managers table).

Not Maintained & Unpaved Roads

Illinois follows this specific guidance on the use of  Off-road / Not maintained   road types and unpaved roads in the state. This supplements the guidance in road types.

Unpaved roads may or may not be classified on IDOT Functional Classification maps. Unpaved roads classified in one of the arterial classes will be mapped as specified in road types guidance and have the unpaved attribute checked. Collector, local and unclassified roads will be mapped as shown in the following table:

Highway System & Road Surface
Gravel Street[b][c]
examples CH-14 Main St Side St Farm Dr Farm Ln
Major Collector  PS   PS   PS   N/M   N/M 
Minor Collector  PS   PS   PS   N/M   N/M 
Local  PS   Street   Street   N/M   N/M 
Unclassified  PS   Street   N/M   N/M   N/M 

^a A road in a county highway system is always mapped as a primary street, adding the unpaved attribute if the county highway is gravel rather than a paved surface.
^b A narrow gravel road is defined as one less than 16.5 feet from edge to edge. This is less than the width of two FHWA minimum lanes. Non-farm vehicles approaching from opposite directions would likely need to leave the roadway to pass.
^c Gravel surfaces should be mapped with the unpaved attribute checked.

 PS   Primary Street 
 Street   Street 
 N/M   Off-road / Not maintained 

To determine if a road falls into the "narrow" or "two-track" categories, measure the distance from edge to edge using by creating a temporary, un-saved, segment. Create the segment positioning the mouse cursor at the road edge at each side. Use the WME Meausurement Tool in WME Toolbox to measure the length of the segment without saving the temporary segment.


This proposal is still being drafted prior to open discussion.