Apple Maps shows a recurring routing behavior involving Rue Poirier-de-Narçay (Paris 14ᵗʰ) that conflicts with both ground truth and the functional road hierarchy represented in OpenStreetMap (OSM). This is not an OSM data issue, but an example of how correctly mapped local streets can be misused by downstream routing engines.

On the ground, Rue Poirier-de-Narçay is a short residential street connecting Avenue du Général-Leclerc to Rue Friant. It has limited width and capacity and is intended for local access only, not for transit. In OSM, it is correctly mapped as a low-hierarchy residential road, with no attributes suggesting a collector or arterial role.

Despite this, Apple Maps frequently routes traffic through Rue Poirier-de-Narçay as part of longer itineraries, typically when Avenue du Général-Leclerc is algorithmically avoided. This routing provides no clear time or distance advantage and results from how road hierarchy is weighted in Apple Maps rather than from incorrect OSM data.
