Illinois has two basic road naming schemes for rural road addressing. One uses a coordinate system, typically expressed as the number of miles North and East of the county line. The other uses road names, with addressing, again, typically the number of miles North or East of the county line.
Separate from the addressing schemes are a system of county maintained highways. These are typically classed as collector roads by the IDOT FC system. In Waze, they would be primary streets.
Currently, several counties use a naming scheme for their addresses of County Rd XXX N/E, abbreviated in Waze as CR-XXX N/E. These counties also have county highways, which, for the most part are not relevant to addressing. Woodford County is one known exception, in that there is one County Highway used for addressing. At this time, ILlinois uses CR-XX for the abbreviation for County Highway as well.
I propose a change to the naming scheme. By using the same scheme for both coordinate and highway names we risk the potential for confusion. My suggestion would be to use CR-xxx for coordinate based names and CH-xx for highway names. In those rare instances where CH- would be the primary name, I have tested the TTS engine and it correctly pronounces County Highway.