How does the moldboard function in proper road grading?

The moldboard is a crucial component of a road grader, designed to effectively shape and smooth the road surface. It functions by displacing material from one side to another, allowing for a uniform and even grade that is essential for proper drainage and vehicle safety.

When the moldboard is adjusted correctly, it levels out any irregularities and fills in ruts or depressions, providing a stable and smooth roadway. This capability ensures that the surface can handle traffic loads effectively, supporting both the structural integrity of the road and the comfort of vehicles using it.

The other choices offer limited or inaccurate functions associated with the moldboard. For instance, the idea of the moldboard shifting soil to one side alone does not encompass its full role in grading, as it is involved in more comprehensive soil management. The concept of the moldboard lifting the grader above the ground is not its purpose; it instead works parallel to the ground. Finally, removing obstacles is typically not within the moldboard's functionality, as that would be more directly associated with other aspects of road maintenance or different machinery.