Bleeding (roads)
Bleeding or flushing is shiny, black surface film of asphalt on the road surface caused by upward movement of asphalt in the pavement surface.[1][2] Common causes of bleeding are too much asphalt in asphalt concrete, hot weather, low space air void content and quality of asphalt.[3]
Bleeding is a safety concern since it results in a very smooth surface, without the texture required to prevent hydroplaning.