A red circle with a white horizontal bar means no entry on a European road sign.
The sign prohibits vehicles from entering the road or carriageway from that direction. It is commonly placed at the end of a one-way street or at an access point where vehicles would travel against the permitted flow.
The design is widely recognized in Europe and is included in the sign systems associated with the Vienna Convention. It is different from a no-vehicles sign, which usually shows a vehicle symbol inside a red circle, and from a no-parking sign, which uses a blue field with red markings in many European systems.
A no-entry sign does not necessarily mean that the road is closed to every user. Pedestrians, cyclists, or authorized vehicles may have separate permissions indicated by additional signs.