Why do breakwaters usually have roadways along their crests?

Breakwaters are constructed to absorb or deflect the energy of powerful sea waves, requiring them to be substantial structures that often face significant wear and tear.12

It is standard practice to include a roadway along the crest of a breakwater, even when it serves no other dockside function. This design feature is primarily intended to provide necessary access for labor, equipment, and materials, which facilitates routine inspections and the repair of any damage caused by wave action.2