About The seven categories of traffic signs (appendix 1): which statement is WRONG?
Every round traffic sign is a prohibition sign.
F1 is listed literally under 'Other commands and prohibitions', not under chapter C 'Closure'.
B1 (priority road) has its own yellow diamond shape, not a triangle.
Road users are required to comply with traffic signs that contain a command or prohibition.
Explanation
trap: shape-without-colour reflex. Command signs (round, blue) are a separate category from category C (round, red border). Round only tells you 'command or prohibition', not which of the two