The fifteenth informal meeting of the GRPE working group on the world-wide heavy-duty certification procedure ( WHDC ) was held on 21 May 2003 , under the chairmanship of Mr. C. Havenith ( Netherlands ) . Experts from the following countries and organizations participated in the work : Belgium ; Canada ; Czech Republic ; Denmark ; Finland ; France ; Germany ; Hungary ; Italy ; Japan ; Netherlands ; Norway ; Poland ; Republic of Korea ; Republic of South Africa ; Russian Federation ; Serbia and Montenegro ; Sweden ; Switzerland ; United Kingdom ; United States of America ; European Commission ( EC ) ; International Organization for Standardization ( ISO ) ; International Organization of Motor Vehicle Manufacturers ( OICA ) ; International Motorcycle Manufacturers Association ( IMMA ) ; European LPG Association ( AEGPL ) ; Engine Manufacturers Association ( EMA ) .