There are "unpassable gates where only transit goes", see https://www.openstreetmap.org/node/2527547337 and https://www.openstreetmap.org/node/1449264340. The respective road ways (https://www.openstreetmap.org/way/5103374 & https://www.openstreetmap.org/way/489939850) are already tagged `access=no`, `bus=yes`. Not sure what else to tell you, other than if you're using an app that routes you down this road it's the app developer's issue, not OSM.