Proposal to introduce appropriate trajectories for each type of M3 vehicle. Envelope 4 represents a specific trajectory for a Class I non-articulated (rigid) M3 vehicle. Envelope 5 represents trajectories for Class II, Class III and articulated M3 vehicles of all classes. The proposal also adds ‘Classification of power-driven vehicles and trailers’ in line with the Consolidated Resolution on the Construction of Vehicles (R.E.3.).