20. GRE noted the progress of the Special Interest Group (SIG) on park conditions and an answer-back signal (GRE-86-10) as well as an approach proposed by the expert from Japan (GRE-86-11). GRE agreed that the requirements for lamps on vehicles in the parked condition would be introduced in two steps:

• Regulating current lighting functions under the parked condition by means of a new 09 series of amendments to UN Regulation No. 48. To avoid a proliferation of new series, GRE agreed that this new series should also include other amendment proposals that were in discussion, such as device transition provisions and headlamp levelling.
• Including the optional use of new lighting functions in the parked condition, by means of a Supplement to the 09 series.