This image of road traffic sign is from the mandatory National Standard of the People's Republic of China GB 5768, Road traffic signs and markings. Per 权司[1999]第50号 issued by the National Copyright Administration, mandatory standards are technical standards with legal natures, so the copyright protection is inapplicable pursuant to Article 5 of the Copyright Law of the People's Republic of China.
I, the copyright holder of this work, hereby publish it under the following license:
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.