What sign indicates a speed limit in Italy?

In Italy, a speed limit is indicated by a circular sign featuring a specific number that represents the maximum speed allowed in that area. This design is standardized throughout many countries, making it easily recognizable to drivers. The circular shape distinguishes speed limit signs from other types of informational signs, which often utilize different shapes to convey various messages.

The number inside the circle specifies the speed limit in kilometers per hour (km/h), providing clear guidance to ensure that drivers are aware of the legal speed restrictions, helping to maintain road safety. This system allows drivers to quickly assess the speed limit just by glancing at the sign.

In contrast, other shapes listed, such as rectangular blue signs typically indicate parking regulations or restrictions, while triangular signs usually denote warnings or caution. A green square plaque is not associated with speed limits but may indicate other types of information, such as directions or points of interest.