Heavy Duty Dual-fuel Engine Retrofit Systems (HDDF-ERS).

Accident Emergency Call Systems (AECS).

Hydrogen and Fuel Cell Vehicles of Category L.

Mechanical Coupling Components of Combinations of Agricultural Vehicles.

Software Update and Software Updates Management System.

Audible Reverse Warning Devices and Audible Reverse Warning Signals.

Approval of Acceleration Control for Pedal Error (ACPE).

Mutual Resolution No. 2 (M.R.2) Containing Vehicle Propulsion System Definitions.

Advanced-warning Triangles.

Audible Warning Devices.