Walk Behind rollers can be double drum model, both types are self-propelled and can work in reverse travel direction. these roller controlled by cable or road linkages. They are used for soil, granular and asphalt compaction and for small area repair and pothole work. walk-behind vibratory rollers are designed for the compaction of all sorts of soils as well as for the compaction of asphalt. The machines feature optimal combination of centrifugal force, vibration frequency and static weight, resulting in excellent compaction effect. By applying combined static and dynamic forces to increase the load-bearing capacity of the surface, a vibratory roller is one of the types of a compactor. It has a drum to densify soil, asphalt, or other materials. The process of densification is carried by transferring vibrations to the surface.