About The seven categories of traffic signs (appendix 1): which statement is WRONG?
Command signs (round, blue) are a separate category from category C (round, red border).
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.
Information signs (category L) are also legally binding, just like command and prohibition signs.
Explanation
trap: binding status pasted onto everything. Only command/prohibition signs fall under the statutory duty to comply. Category L (information) is not legally binding