What is the purpose of "microsurfacing" in asphalt maintenance?

Microsurfacing is a technique used in asphalt maintenance primarily to restore surface texture and provide waterproofing to the existing pavement. It involves applying a thin layer of a mixture of polymer-modified asphalt emulsion, fine aggregate, water, and other additives onto the roadway surface. This not only revitalizes the road's surface by improving its texture, thus enhancing vehicle traction, but it also seals the underlying layers, preventing moisture from infiltrating and causing further damage. This waterproofing effect is crucial in prolonging the life of the pavement and reducing the need for more extensive repairs in the future.