Design
Mandatory signs are a subset of the regulatory sign group as defined by the United Nations Economic and Social Council in the Vienna Convention on Road Signs and Signals of 1968, and are often seen not just on their own, but used in conjunction with other signs, traffic lights and bollards as a form of visual shorthand within these objects. In Vienna signatories, the mandatory sign is either a light blue circle with a white border or a white circle with a red border. The sign must be at least 60 cm (1.96 ft) across on rural roads, or 40 cm (1.31 ft) in built-up areas, although mandatory signs incorporated in traffic lights, bollards or larger road signs can be as little as 30 cm (0.98 ft) in diameter.
The mandatory sign group is not used in the United States and Canada, who are not signatories to the Vienna Convention; both countries consider them kinds of regulatory signs. Some Canadian provinces differentiate mandatory signs from prohibitive ones by enclosing the symbols in a green rather than red border, although this can indicate either a mandatory or a warning sign, while in the U.S., the only difference between a prohibitory sign and a mandatory one is that a mandatory sign includes the word "only" at the bottom of the plate instead of crossing out the pictogram.
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