C21: Driving in both directions prohibited
C21 · Prohibitory signs

Driving in both directions prohibited

På dansk Kørsel i begge retninger forbudt

Traffic is prohibited in both directions - the road is closed to you, whichever way you are going.

C Round with a red border: something is forbidden - entry, a manoeuvre, a speed, parking.

Practise C signs All signs See it in a real scene
Neighbours in the same family These are the ones people mix up — compare them side by side.
C11.1: No right turn C11.1 No right turn C11.2: No left turn C11.2 No left turn C12: No U-turns C12 No U-turns C19: No entry C19 No entry C22.1: No motor vehicles C22.1 No motor vehicles C22.2: No motorcycles or large mopeds C22.2 No motorcycles or large mopeds C23.1: No heavy goods vehicles C23.1 No heavy goods vehicles C23.2: No buses C23.2 No buses

Drawing from Wikimedia Commons, free of copyright under section 9 of the Danish copyright act. Code and name follow executive order 425 of 13 April 2023 on road marking. Study material, not the legal text.