Which aspect of a road grader is essential for controlling the angle and depth of grading?

The blade of a road grader is the key component responsible for controlling the angle and depth of grading. The blade is designed to manipulate the surface of the road by adjusting its position and angle relative to the ground. This adjustment is fundamental to achieving the desired profile and smoothness of the roadway. By tilting or angling the blade, an operator can effectively manage how much material is being cut or distributed, which is crucial for proper drainage and surface evenness.

The ability to raise or lower the blade directly influences the depth of cut, enabling precise grading operations. Operators can refine their technique by making adjustments with the blade to tackle varying terrain and material types, ensuring optimal results for road maintenance and construction tasks. Other components such as the tires, engine, and cabin controls support the machine's operation, but it is the blade that directly facilitates the physical act of grading.