What it means
The Spanish DGT sign S-1A belongs to the information signs family (rectangular or square, blue). It means: dual carriageway. As with every sign in this family, the theory exam typically combines it with right-of-way, speed-limit or general-traffic-rule questions — so it pays to memorise both the visual and the context in which it appears.
- Category
- Information signs
- Shape
- Rectangular or square, blue
Practise DGT questions featuring this sign
Ten DGT 2026 exam-style questions about signs, with an explanation after each. Free, no signup.
Variants of family S-1
Other related signs
S-347
Senal of destino of salida inmediata hacia una zona area o via of servicios con salida compartida hacia una motorway o dual carriageway
S-348A
Senal of destino on desvio
S-348B
Senal variable of destino
S-350
Senal sobre la carriageway on carretera covencional salida inmediata hacia conventional road
S-351
Senal sobre la carriageway on motorway o dual carriageway salida inmediata hacia conventional road
S-354
Senal sobre la carriageway on carretera covencional salida inmediata hacia motorway o dual carriageway
S-355
Senal sobre la carriageway on motorway o dual carriageway salida inmediata hacia motorway o dual carriageway