May cyclists over 14 years of age ride along the hard shoulders of dual carriageways (autovías)?

May cyclists over 14 years of age ride along the hard shoulders of dual carriageways (autovías)?
A)Yes, both along the hard shoulders of dual carriageways (autovías) and those of motorways (autopistas).
B)No, it is prohibited for road safety reasons.
C)Yes, unless for road safety reasons it is prohibited by signs.Correct
Cyclists over 14 years of age may ride along the hard shoulders of dual carriageways (autovías), unless, for justified road safety reasons, it is prohibited by the corresponding signage. Such prohibition shall be complemented by a panel informing of the alternative route.
Cycling on motorways (autopistas) is prohibited.