11. The Secretary of the WLTP informal working group introduced GRPE-64-27, containing an updated roadmap, illustrating its main modifications and confirming the need for a special GRPE session, in late 2013, for the final review and adoption of the draft UN GTR.

12. The Secretary of the WLTP informal working group also reported on the progress made by the sub-group on the Development of the Harmonized driving Cycle (DHC), introducing GRPE-63-28. He summarized the results of validation phase 1, he introduced briefly the profile of the version 5 of the World Light Duty Test Cycle (WLTC), and touched upon the work on the gear shift prescription. He mentioned that five out of nine open issues have been solved, explaining that further discussion is needed for cycle modifications and next actions, with a solution expected by the end of the year. He added that mode construction and gear shift points were the remaining items to address.

13. The WLTP Secretary reported about the proposal from Japan to introduce further modifications to version 5 of WLTC. The expert from the EC expressed some concerns on such modifications to the test cycle, underlining that the EC favours the version 5 of the WLTC, as agreed before. The experts from France and Italy underlined the importance of the representativeness of the test cycle with respect to pollutant emissions, CO2 emissions and fuel consumption, also underlining the need to take into account regional specificities and to the importance of the WLTC for accurate consumer information, since the WLTC is expected to be used for the characterization of energy efficiency labels.

14. The Chair of the sub-group on the Development of the Test Procedure (DTP) introduced GRPE-64-30, informing GRPE on the development of validation phase 2 by the Validation Task Force (VTF), on the activities of the Lab Process-Internal Combustion Engines (LabProcICE) subgroup, on the work of the Lab Process-Electric Vehicles (LabProcEV) sub-group, and the progress of the Additional Pollutants (AP) sub-group. Speaking about the UN GTR drafting work, he announced a draft UN GTR text should be submitted at the next GRPE session.

15. GRPE took note of the updated roadmap, acknowledging it does not result in a postponement of the WLTP finalization. The Working Party agreed that the special session the final adoption of the draft GTR should be held back to back with the WP.29 session of November 2013, subject to the confirmation from WP.29 and the secretariat. GRPE also agreed that the WLTP subgroups should meet in conjunction with its session in January 2013 (note by the secretariat: at its 157th session, WP.29 gave its consent to hold the special session of GRPE on Thursday afternoon, 14 November 2013).