Experts from the following countries participated in the work , following Rule 1 ( a ) of the Rules of Procedure of the World Forum for Harmonization of Vehicle Regulations ( WP.29 ) ( TRANS/WP.29/690 , ECE/TRANS/WP.29/690/Amend.1 and Amend . 2 ) : Australia , Belgium , Brazil , France , Germany , Hungary , Japan , the Netherlands , Portugal , Republic of Korea , Spain , Sweden , Thailand , Turkey , the United Kingdom of Great Britain and Northern Ireland ( UK ) , the United States of America ( USA ) and Uruguay .