The official designation of the signs with a red bar on a white post. From the Department for Transport is "No through road for vehicles". This is utterly untrue here, you can drive down this road and out the other end off into the wild blue yonder.
This sign has been placed by the local council because they are so arrogant that they think they can decide who drives down roads, irrespective of any legal requirements.
This is Charlwood Road, Putney, London