39. The expert from Germany informed GRE about the outcome of the discussion of the Working Party on Road Traffic Safety (WP.1) at its September 2012 session (GRE-68-11). The Secretary to WP.1 reported on the work done by his group, especially on updating the new draft Annex 5 to the Vienna Convention, dealing with vehicle lighting and light signalling. GRE noted that the work progress of WP.1 in that case is slower than its own pace. Some expert remarked that this is causing a formal issue as the Vienna Convention might need a longer time to be updated and to take into consideration work progress of WP.29. The experts from CLEPA recalled that investments were deployed in the transport sector by the industry creating better safety and the environmental conditions. He mentioned, as an example, the framework of the United Nations activities on Intelligent Transport Systems and the activities on “road trains”. He concluded that there is a need to find a more flexible consensus at WP.1 for ensuring adaptation of the Vienna Convention to the technical progress. The Secretary to WP.1 reported on the work ongoing in WP.1 on Advance Driver Assistance Systems (ADAS) and different issues like “road trains” or “google cars” and pointed out the difficulty of progressing id est the liability aspect in case of accident. GRE agreed to keep this item on its agenda for its next sessions, wishing fruitful outcome discussions from future WP.1 sessions.