About The seven categories of traffic signs (appendix 1): which statement is correct?
Road users are required to comply with traffic signs that contain a command or prohibition.
Every round traffic sign is a prohibition sign.
The priority-road sign (B1) is a triangle, just like a warning sign.
The overtaking-ban sign (F1) belongs to category C, because it is a round sign with a red border like the other prohibition signs.
Explanation
trap: information-sign status pasted onto a prohibition. Road users are required to comply with traffic signs that contain a command or prohibition. That is a statutory duty, not advice