No Symbol - Variants

Variants

In contrast, a green circle with no line through it may be used as a Yes symbol, or the "anti prohibition sign", indicating that the activity represented inside the circle is permitted, but this is not official. It is mainly used to give advice, rather than to say what must be done.

In the UK, a filled blue circle (with no white inner circle) is used for positive signs, e.g. the wearing of a helmet on a building site, or the fact that a pathway is for pedestrians and cyclists. The "no" symbol does not always have the "slash" across it; in all traffic uses other than no turn, European "no" signs are illustrated just with the prohibited action circled in red. An exception to this is the "No stopping" or "clearway" variant, this is illustrated with a red circle with a blue background and two diagonal "slashes" forming an X. However according to the UK highway code signs with red circles are mostly prohibitive, and classifies these signs as "signs giving orders" rather than prohibition signs.