< Michigan | Major roads
NOTE: Michigan follows the GLR road locking standards for all roads
County Highways versus County Roads
- Michigan has an "intercounty" highway system in addition to locally maintained county roads. In both cases, naming conventions should follow highway naming by state.
- Numbered county highways are prefixed with A through H based on geography. Naming convention should be "CR-[Letter Prefix][#]" (i.e. "CR-D19"). In all cases, local signage should be used to designate a primary name, while the county highway designation could be an alternate name if appropriate. While these roads could conceivably be classified higher, the lowest road type used should be Minor Highway regardless of appearance or functional classification.
- A small number of counties maintain numbered county roads that are not part of the statewide A-H highway system. These roads should be named CR-[#] (i.e. "CR-388") and would typically appear as Primary Street, Street, or even Dirt Road.
State Numbered Highway Naming
The following proposal for a new national state highway naming standard is currently under review by the GLR State Managers.
Primary Street Name: Use whatever name is in common usage in that area. (Check business addresses, GIS, etc). If the commonly used Primary Street name is not the state's Numbered Highway name (Example: M-59), include an alternate street name with the Numbered Highway name.
When to include a City Name on a State Numbered Highway:
- Freeways
- Primary Street Name: No City Name
- Alternate Street Names: No City Names
- mH/MH Numbered Highway
- divided roadway with limited access:
- Primary Street Name: No City Name
- Alternate Street Names: No City Names
- all other mH/MH Numbered State Highways
- Primary Street Name: Include a city name in locales that use city names.
- Alternate Street Names that use a state Numbered Highway name (Example: M-59): No City Name
Functional Classification
Michigan follows the Waze Functional Classification (FC) standard for determining what Road Type to use for all paved roads.