Vienna Convention on Road Signs and Signals (English Wikipedia)

Protocol on Road Signs and Signals (PDF). United Nations Conference on Road and Motor Transport. United Nations Treaty Series (in English and French). Vol. 182. Geneva, Switzerland. 19 September 1949 – via United Nations Treaty Collection.
"C.N.172.2025.TREATIES-XI.B.20" (PDF). Retrieved 15 May 2025.
"C.N.173.2025.TREATIES-XI.B.24" (PDF). Retrieved 15 May 2025.
"C.N.174.2025.TREATIES-XI.B.25" (PDF). Retrieved 15 May 2025.
"Article 29". Convention on Road Signs and Signals (PDF). United Nations Treaty Series (in English, French, Chinese, Russian, and Spanish). Vol. 1091. Vienna. 8 November 1968. p. 27 – via United Nations Treaty Collection.{{cite book}}: CS1 maint: location missing publisher (link)
"Chapter XI Transport and Communications - B. Road Traffic - 20. Convention on Road Signs and Signals". United Nations Treaty Collection. United Nations. 16 January 2022. Archived from the original on 10 August 2021. Retrieved 23 October 2022.

unece.org (Global: 2,442^nd place; English: 2,402^nd place)

"Chapter XI Transport and Communications - B. Road Traffic - 20. Convention on Road Signs and Signals". United Nations Treaty Collection. United Nations. 16 January 2022. Archived from the original on 10 August 2021. Retrieved 23 October 2022.