What types of roads cause more fatigue in the driver?

A)Motorways.
B)Motorways and dual carriageways.Correct
C)Conventional roads.
The decrease in attention that gives rise to fatigue can appear on any type of road but it is more common to occur on motorways and dual carriageways if we drive long periods on them, as they are more monotonous roads, without apparent obstacles, speed changes or the appearance of curves or other dangers.