Graders are commonly used in the construction and maintenance of dirt roads and gravel roads. In constructing paved roads, they prepare a wide flat base course for the final road surface. Graders are also used to set native soil or gravel foundation pads to finish grade prior to the construction of large buildings. Graders can produce canted surfaces for drainage or safety. In some countries they are used to produce drainage ditches with shallow V-shaped cross-sections on either side of highways.