Core: The seven categories of traffic signs (appendix 1)

Road users are legally required to comply with traffic signs that contain a command or prohibition — that applies to categories B, C, D and F. Category B (priority) has its own shape: the yellow diamond, not a triangle. B1 is the priority road, B6/B7 regulate priority at an intersection. Category C (closure) and category F (other commands/prohibitions) both look round and red-and-white — same appearance, different chapters. The overtaking ban (F1) belongs to F, not C, however prohibition-like it looks. Category D (direction) is also round, but blue: a command, not a prohibition — for example D1 roundabout. Category J (warning) is the triangle with a red border, and category L (information) the blue rectangle — neither carries the the law command/prohibition duty, purely warning or informing.