UNECE Regulation 13 mandates the use of the standardized ISO 7638 connector for relating braking signals between a towing and a towed vehicle; however, such is not possible when using a fully automated coupling system.

Therefore, the GRRF is pursuing amendments to UNECE R13 to establish alternative requirements to cover this situation.

This effort will also produce a new definition for FACS under UNECE R55.

The first phase focuses on Category N3, O3, and O4 vehicles vis-à-vis FACS.

A second phase may address requirements for modular vehicle combinations and totally integrated vehicle combination control systems.