The introduction of requirements for automatic levelling for headlamps with transitional provisions of 90 months was also considered . WP.29/AC.2 recommended transmitting the proposal adopted by GRE as a Supplement to the current series of amendments for consideration by WP.29 and by the Administrative Committee of the 1958 Agreement ( AC.1 ) at their November 2011 sessions instead of a new series of amendments that could interfere with new series of amendments adopted during the 90 month transitional period .