What is the maximum permissible width of this truck tractor with mounted implement?

Your answer is correct: the maximum permissible width for this truck tractor with a mounted implement is 3.0 meters.

In Germany, the general maximum width for vehicles, including agricultural machinery like the one shown, is 2.55 meters. However, for agricultural and forestry vehicles, this limit is extended to 3.0 meters to accommodate mounted equipment.

This width ensures that the vehicle can still safely use public roads, while the mounted implement can extend up to this limit. It is important for such wide vehicles to display appropriate warning signs or markings, like the red and white reflective boards shown in the image, to alert other road users to the extended width.

Remember, exceeding this width would require special permits or restrictions, so always measure and respect the 3.0-meter maximum for such vehicles on public roads. This rule helps maintain road safety by balancing equipment functionality with safe traffic flow.