About the reduction effect of tire/road noise of longitudinal groove rough surface hybrid pavement

Longitudinal groove rough surface hybrid pavement is a unique construction method, which provides 1) the excellent drainage function close to the road surface with the single layer top surface mixtures and 2) the watertightness in the subsurface pavement which is comparable to the stone mastic asphalt mixtures. Longitudinal groove rough surface hybrid pavement, which is a feature of this construction method, was made possible by an asphalt finisher with the improved compaction apparatus. Longitudinal groove rough surface possesses the durability, which is sustainable even in heavy traffic like highways, and also made it possible to reduce the tire/road noise if compared with the pavement whose road surface becomes dense with use. In addition to the reduction of tire/road noise, this construction method has more functions, one of which is adopting it as an accident countermeasure pavement due to the empirical performance in the reduction of highway's accident. This paper describes about the functions and effects such as tire/road noise that is maintained by this longitudinal groove rough surface hybrid pavement.