trafficfurnitur
According to Oakland GIS, north of 61st St, this is not a shared bicycle lane.  I'm guessing the sharrow paint just north of 61st that is visible on Bing aerial view is a mistake.  https://oakgis.maps.arcgis.com/apps/MapSeries/index.html?appid=e778c7f232c8400182a7f11e7449b9b2