Which letter is used as the distinguishing sign of Spanish nationality?
Traffic safety: Plates
Explanation
The **letter E** is used as a distinctive sign of Spanish nationality on European roads. This is because European roads, which are those that have a name recognized throughout Europe, use the letter E to identify their connection with Spain.

In the image, you can see how the sign of a European road includes the letter E, indicating that it is a road that is part of the European network and is related to Spain. This letter is an international standard for identifying the nationality of roads in Europe, and that is why the E is used for Spain.
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