Frequently referred to as crusher run, quarry process (QP) or dense grade aggregate (DGA), crush and run is comprised of pulverized stone and stone dust. Depending on the quarry where the material was manufactured, crush and run could be made up of crushed, screened and sized limestone, trap rock or granite. Crush and run gravel is made from tiny pieces of gravel that is mixed with limestone. This is a useful top layer for gravel driveways because the limestone sticks together when wet, helping the driveway last longer. Crush and run gravel driveways are affordable and can last for years if they are properly maintained.