What role does drainage play in maintaining highways?

Drainage is a critical aspect of highway maintenance because it prevents water accumulation that could lead to various forms of damage. Proper drainage systems are designed to direct water away from the road surface, preventing pooling and saturation of the pavement materials. Without effective drainage, water can infiltrate the pavement structure, causing issues such as erosion, cracking, and ultimately compromising the integrity of the roadway.

Excessive water can weaken the underlying soil and subgrade, lead to pavement deformation, and contribute to pavement failures. By directing water away from the road, drainage systems help to prolong the lifespan of the highway, ensuring safety for vehicles and reducing maintenance costs over time. This not only enhances the durability of the highway but also helps to maintain its structural performance under varying weather conditions.