
die Absperrung
barrier
A barrier, fence, or tape used to make a certain area inaccessible or to control access.
Die Polizei hat um den Unfallort eine Absperrung errichtet.
The police set up a barrier around the accident site.
barrier / closure
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barrier
A barrier, fence, or tape used to make a certain area inaccessible or to control access.
Die Polizei hat um den Unfallort eine Absperrung errichtet.
The police set up a barrier around the accident site.

closure
The process of blocking off; the act of blocking an area.
Die Absperrung der Straße für das Stadtfest beginnt um 8 Uhr morgens.
The closure of the street for the town festival begins at 8 in the morning.
'Absperrung' (barrier / closure) is a noun derived from the separable verb 'absperren' (to block off). The ending '-ung' turns the verb into a feminine noun that can refer both to the action and to its result, the barrier.
Die Polizei musste die Straße absperren.
The police had to block off the street.
The context tells you whether the action or the object is meant. Verbs like 'errichten' (to erect / set up) or 'aufstellen' (to set up), and prepositions like 'hinter' (behind), point to the barrier. Time expressions or a genitive object, such as 'die Absperrung der Brücke' (the closure of the bridge), refer to the action.
Die Zuschauer mussten hinter der Absperrung warten.
The spectators had to wait behind the barrier.
Certain verbs are often used in connection with the barrier: you can 'errichten' (erect / set up), 'aufbauen' (set up), 'durchbrechen' (break through), or 'entfernen' (remove) an 'Absperrung' (barrier).
Für das Konzert wurde eine große Absperrung errichtet.
A large barrier was set up for the concert.
fence
A Zaun and an Absperrung can both mark off an area. Zaun primarily refers to the structure made of wood, metal, or wire; Absperrung emphasizes its function of preventing or controlling access and is often used for temporary barriers.

Eine mobile Absperrung aus Metall verhindert vorübergehend den Zugang zur Baustelle.
A mobile metal barrier temporarily prevents access to the construction site.
Ein hoher Zaun aus Metall grenzt die Baustelle vom Gehweg ab.
A tall metal fence separates the construction site from the sidewalk.