This image is in the public domain according to German copyright law because it is part of a statute, ordinance, official decree or judgment (official work) issued by a German authority or court (§ 5 Abs.1 UrhG).
This road sign image is in the public domain according to German copyright law because it is part of the German Verkehrszeichenkatalog (Road Sign Catalogue), Straßenverkehrsordnung (Road Traffic Code) or other statues, ordinances or official decrees proclaimed in the Verkehrsblatt (Traffic Gazette) (§ 5 Abs. 1 UrhG).
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.