Are vehicles for persons with reduced mobility required to travel on the hard shoulder?

A)No, but they may travel on the hard shoulder whenever they see fit.
B)No, it will depend on the instructions of traffic officers and the type of road.
C)Yes, in the event that there is no road or part of a road specially designated for them.Correct
As a general rule, and in the event that there is no road or part of a road specially designated for them, vehicles for persons with reduced mobility and persons travelling in a wheelchair, among others, are required to travel on the right-hand hard shoulder, if it is passable and sufficient for each of them, and if it is not, to use the minimum necessary part of the carriageway.