Whitetopping, placing a thin concrete overlay directly on an asphalt surface, is suitable for a number of applications. This two-year-old driveway in Michigan has shown no uncontrolled or random cracking in the 3 1/2-inch layer of concrete. Careful layout of the joints has contributed to the driveway's success. Studies are being done as to whether a bond between the asphalt and overlay can reduce stresses in the concrete.