Regulatory Signs
Regulatory signs compel or forbid a specific action and are legally enforceable. They split into sub-classes: control signs that assign right of way (the octagonal Stop Sign and the inverted-triangle Yield Sign); command signs (blue background, white symbol) telling you what you must do (e.g. Minimum Speed Sign, Keep Left Sign, Compulsory Direction Sign); and prohibition signs (white background, red border) telling you what you must not do (e.g. No Entry Sign, No Overtaking Sign, No U-Turn Sign, Speed Limit Sign, No Parking Sign, No Stopping Sign).
The most-tested confusion is colour-as-meaning: blue = you must; red border = you must not. A blue minimum-speed circle is frequently misread as a maximum.
Ontology Regulatory Signs [part-of] Road Signs Signals and Markings Stop Sign [part-of] Regulatory Signs Yield Sign [part-of] Regulatory Signs
Learning objective
Recognise control, command and prohibition signs and know that they are legally enforceable.
Question patterns
- Is this sign a command (blue) or a prohibition (red border)?
- What must / must not you do?
Common mistakes
- Reading a blue command circle as a prohibition
- Confusing No Entry with One-Way
Connections
- Stop Sign — covers_topic, source: 2026-06-28
- Yield Sign — covers_topic, source: 2026-06-28
- Road Signs Signals and Markings — part_of_topic, source: 2026-06-28