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.
- CategoryInformation signs
- ShapeRectangular 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
Gives advance directions, through overhead signs, on a motorway or dual carriageway toward any road
S-235A
Gives advance information with overhead signs on a motorway or dual carriageway for directions toward any road and the continuing direction
S-242
Gives advance information on a motorway or dual carriageway for two very close exits toward any road
S-242A
Gives advance information on a motorway or dual carriageway for two very close exits toward any road and the continuing direction
S-250
Gives advance notice of an itinerary
S-260
Gives advance information about lanes
S-261
Advance signing on a conventional road for a service zone or area
S-263
Gives advance information on a motorway or dual carriageway for a service zone or area with a shared exit