Regulation No.51: Uniform Provisions concerning the Approval of Motor Vehicles having at least Four Wheels with regard to their noise emissions (July 15, 1982) Countries/Territories Entry into force Belgium Jul 15, 1982 Bulgaria Nov 22, 1999 Bosnia and Herzegovina Sep 28, 1998 Belarus May 3, 1995 Czech Republic Jun 2, 1993 Germany Jan 14, 1991 European Union Jan 23, 1998 Spain Jul 15, 1982 Estonia Oct 29, 1998 Finland May 6, 1988 France Dec 19, 1986 United Kingdom Jun 17, 1993 Greece Oct 4, 1995 Croatia Mar 17, 1994 Hungary Jan 26, 1984 Italy Mar 7, 1983 Lithuania Jan 28, 2002 Luxembourg Mar 2, 1984 Latvia Nov 19, 1998 Netherlands Apr 22, 1985 Norway Mar 25, 1993 Poland Sep 14, 1992 Romania Dec 5, 1983 Russian Federation Dec 19, 1986 Slovakia May 28, 1993 Slovenia Nov 3, 1992 Sweden Jun 3, 1997 Turkey May 8, 2000 Ukraine Aug 9, 2002 Serbia Mar 12, 2001 Montenegro Oct 23, 2006 Egypt Apr 1, 1998 San Marino Dec 5, 2012 Switzerland Nov 27, 2015 Malaysia Dec 14, 2010 Japan Feb 3, 2006 North Macedonia Jun 13, 2016