An overlay adds structural capacity, riding comfort and skid resistence, which add to the road's safety. Smooth road surfaces also decrease vehicle maintenance costs and improve fuel economy. Pavement overlays help reduce traffic noise, which is important in urban developments. While newly overlaid roads are aesthetically pleasing, roads are not overlaid to improve appearance. Pavement deterioration is cumulative.
Pavements generally deteriorate at an ever increasing rate.
Factors including, weather, traffic impacts, frequency of maintenance, etc. Routine maintenance . If routine maintenance is not performed restoration costs are four to five times higher. When is it done . . . Asphalt overlays are usually done each summer.