An inexpensive and popular driveway gravel. This is the same material that is used on gravel roads and in alleyways. Roadbase is made of 3/4″ rock plus clay fines. The rock provides a stable mud free surface and the fines and clay provide a packed base. The 3/4″ roadbase is the size normally stocked in the yards. This material packs hard and is good for driveways, parking areas or as a base under concrete or asphalt. Roadbase resists washout the best of any of the driveway materials and works well for driveways on slopes.