19. The World Forum recalled that at its March 2010 session the co-Chairs of the informal group on Intelligent Transport Systems (ITS) had reported on the progress made by the informal group. Informal document No. WP.29-150-21 contained the major amendments introduced in the guidelines on establishing requirements for high-priority warning signals (WP.29-150-22). It was also recalled that the World Forum had agreed to refer WP.29-150-22 to its GRs and that comments should be transmitted to the secretariat for the submission of an updated proposal to WP.29 for final consideration and adoption at its March 2011 session. The World Forum noted that no meeting of the informal group on ITS was scheduled for this session.