What is the significance of maintaining a proper grading elevation?

Maintaining a proper grading elevation is crucial primarily because it ensures proper drainage and structural support. When the grading is accurately performed, it allows water to flow away from the highway surface and prevents accumulation, which could lead to hazardous driving conditions, erosion, or even the degradation of the road materials. This drainage is essential to prolong the life of the highway and maintain safety for all users.

Furthermore, the correct grading provides a stable foundation for the pavement structure. If the grading is off, it can result in uneven settling or subsidence, which might compromise the integrity of the highway over time. This foundational support is key to preventing premature failure of roadway surfaces and ensuring that they remain safe for vehicular traffic.

While other aspects, such as aesthetic appeal, may have some relevance, they do not address the immediate and practical requirements of highway safety and durability as effectively as proper drainage and structural support do.