Asphalt paving contractors complete a broad range of tasks for clients. Projects range from filling potholes to installing blacktop on an unpaved surface. Installation projects can be relatively small, like paving a residential driveway. They can be large, such as building a new road. Much of the time, the workers are busy repairing flaws that develop because of heavy traffic and certain types of weather. An Asphalt Overlay Owners of parking lots typically want to upgrade the pavement when the older blacktop has faded to a dull gray and the paint has worn off.