27. The expert from IMMA proposed to allow the installation of light-signalling devices with light sources that can be sequentially activated (ECE/TRANS/WP.29/GRE/2015/39). GRE adopted this proposal as amended by Annex IV and requested the secretariat to submit it to WP.29 and AC.1 for consideration and vote at their March 2016 sessions as draft Supplement 18 to the 01 series of amendments to Regulation No. 53.