Before revision: In the EU EEC regulation 3821/ 85EUR-Lex – 31985R3821 – EN from 20 December 1985 made tachographs mandatory throughout the EEC as of 29 September 1986.
After revision: In the EU EEC regulation 3821/ 85 on recording equipment in road transportEUR-Lex – 31985R3821 – EN from 20 December 1985 made tachographs mandatory throughout the EEC as of 29 September 1986.