Impact attenuator is a crash attenuator. It is a device intended to reduce the damage done to structures, vehicles and motors. It is designed to absorb the errant vehicle like kinetic energy and redirect the vehicle from the hazard. It is a collection of sand and water filled barrels and are placed in freeways, such as gore points and overpass supports. It is available in two types such as truck-mounted and freestanding impact attenuators. Truck-mounted attenuators are safety devices used for mobile operations conducted in traffic.