I believe `traffic_sign=none` was discussed to mean no plates, but there can be markings https://community-cdn.openstreetmap.org/uploads/default/original/2X/c/cec22899d55dead5714839e00eb430e9f6f92037.jpeg https://community.openstreetmap.org/t/fahrradinfrastruktur-tagging-realitat-und-fragen/8417