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A solid blue circle instructing rather than forbidding.
Also known as: Vienna mandatory sign, Blue disc instruction sign
A filled blue circle with a white pictogram gives a positive instruction: this is what you must do. It is the exact inverse of the red-ringed prohibitory sign, and the colour rather than the shape is what distinguishes them.
Instructs a required action, drawn as a solid blue disc with a white pictogram.
Contexts: Road signage
Inverts the prohibitory sign's logic while sharing its circular shape, so colour rather than form separates must-do from must-not.
Contexts: Road signage
A circle filled with a solid blue field carrying a white pictogram or arrow.