The goal is to have a mechanism for attaching localities or hamlets to a city.
The French wiki presents a number of situations (https://wazeopedia.waze.com/wiki/France/Routes_Nommage).
There is also the management of districts or neighborhoods of large cities that could also benefit from this feature.
Geoffrey Perez (geopgeop) commented
First off, I'll put it out there that I would think this idea isn't necessarily limited to French, just in case someone thought otherwise.
In the Philippines, nearly all cities are subdivided into at least more than one barangay and are almost always used in addressing (Manila being the exception where district is used instead, given the sheer number of barangays in that city)
Elsewhere, of particular note, in San Francisco, California, USA, there are a few streets in completely different neighborhoods that have the same name but are otherwise unrelated to each other. Mason Street in the Presidio and in North Beach, and 3rd Street in SoMA and in Treasure Island are two pairs of same-name streets that come to mind. Having sub-cities implemented would certainly make it easier to disambiguate between members of the pairs.
Need this. Here we call them boroughs. Within Montreal we have several boroughs that have 1st street / 1st avenue. We need a way to distinguish them. Now we're forced to split up the city into "City (borough name)"
Having a new field for sub-divisions for cities will help with this.