andrepoiy
In Ontario, lots of times, "Regional" or "County" roads only signify that the County or Region maintains it, and their respective County Road networks aren't necessarily good indicators of how important a road is. 

One example in Peel Region is Mavis Road, where the Regional Part is only like 1 km long. https://www.openstreetmap.org/relation/4423469#map=15/43.6431/-79.7432

Another example, in York Region, Ravenshoe Road is still maintained by the Region even when it becomes a farm access road, seen here: https://www.openstreetmap.org/#map=16/44.1841/-79.5077

However, most of these cases in cities have been resolved by downgrading, but since this is quite a rural probably nobody noticed this.
