What it means
The S-821 sign indicates extension of the prohibition to one side. It is a supplementary panel specifying toward which side from the signed point a main prohibition continues or applies, so you must always read it together with the sign above. It is usually placed below parking, stopping, or other prohibition signs when their lateral scope must be delimited. When you see it, identify the prohibition first and then check the indicated side before deciding whether you may stop, park, or perform the affected behaviour. In the test they often expect you not to treat the panel as an independent sign or ignore the arrow.
- 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.
Other related signs
S-235
Presenalizacion con senales sobre la carriageway on motorway o dual carriageway hacia cualquier carretera
S-235A
Presenalizacion con senales sobre la carriageway on motorway o dual carriageway hacia cualquier carretera y direction propia
S-242
Presenalizacion on motorway o dual carriageway of dos salidas muy proximas hacia cualquier carretera
S-242A
Presenalizacion on motorway o dual carriageway of dos salidas muy proximas hacia cualquier carretera y direction propia
S-250
Presenalizacion of itinerario
S-260
Presenalizacion of carriles
S-261
Presenalizacion on conventional road of zona o area of servicios
S-263
Presenalizacion on motorway o dual carriageway of una zona o area of servicios con salida compartida