Road signs in the Republic of Bulgaria were introduced by the Road Traffic Act and are regulated by: * Regulations for the implementation of the Road Traffic Act, adopted by a Decree of the Council of Ministers; * Ordinance No. 18 of July 23, 2001 on road signaling with traffic signs, issued by the Minister of Regional Development and Public Works. Both normative documents are harmonized with the Vienna Convention on Road Signs and Signals (1968), which was ratified by Bulgaria on December 28, 1978. (This Convention was not published in the State Gazette).