Will be drafting language for the new unpaved and Off-road / Not Maintained on Road Type
Current wazeopedia:
Other drivable roads 
Off-road / Not maintained Road
The Off-road / Not maintained (formerly Dirt Road / 4x4) type has the unique property that Waze users may ask not to be routed over it. Users may ask to avoid it for all through routing with the settings option "Dirt roads - Don't allow", or to avoid it for through routing longer than 300 m (984 ft) with the option "Dirt roads - Avoid long ones".
Because of this property, this type typically represents public side roads that some fraction of local drivers habitually avoid due to surface quality. In metropolitan or other urbanized regions, this generally means unpaved (dirt, gravel, crushed rock) roads, or roads in uncommonly poor condition by local standards. In other areas, roads with unpaved surfaces may be essential routes and thus necessarily set to other types such as Street, Primary Street, or even higher, as if they were paved.
Check your state page for details on whether your state follows unique guidelines for dirt roads, or contact your regional coordinator for further guidance.