This little piece of Cahill Avenue is incorrectly marked as it does not exist so should be removed from OSM. It is in Webster Groves, and the official Webster Groves city map (their GIS map) shows that this "street" is part of a lot of a private home:  https://webstergroves.maps.arcgis.com/apps/View/index.html?appid=284551609b944b39b65246c6cc5c786a 