What does this sign mean?
A)Mandatory carriageway for motor vehicles, except motorcycles without a sidecar.
B)Mandatory carriageway for motor vehicles.
C)Road reserved for motor vehicles.Correct
The sign in the question indicates the beginning of a road reserved for motor vehicles (prohibited to all other users).
Do not confuse it with the sign for a mandatory carriageway for motor vehicles, except motorcycles without a sidecar.