As stated above, DG can be a useful tool to correct functional distresses caused by pavement surface defects, such as, noise, roughness, and skid resistance. When noise has become an issue, research data shows that DG can reduce noise level significantly. Pavement roughness increases dynamic loading and resulting wheel loading stresses, thus reducing pavement life. Pavement roughness can be effectively corrected by DG. DG increases macro-texture of the surface, thus improving drainage and skid resistance, and reducing the potential for hydroplaning.