What does this information sign with a blue background and the white front silhouette of a car indicate?

Question

DentroTest · Accepted Answer

Sign S-3, "Road reserved for motor vehicles", indicates the start of a road reserved exclusively for motor vehicles and closed to other users, such as mopeds, bicycles, pedestrians or animal-drawn vehicles. It must not be confused with the dual carriageway sign (S-1a), which indicates the start of a dual carriageway, or with an "expressway (vía rápida)", a concept that the 2003 General Traffic Regulations removed from the Traffic Law.

What does this information sign with a blue background and the white front silhouette of a car indicate?

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