TMAs (Truck Mounted Attenuators) are required for the protection of works on or adjacent to all high speed roads. 

TMA's are deployed to protect many other road maintenance and construction worksites, and to protect both workers and occupants of vehicles to save lives and prevent injury.

They are also applicable under the hierarchy of safety controls for the protection of works on all other roads where substantive speed limits are 80Km/h or more.

Truck or Trailer Mounted Attenuators can only be operated by fully trained staff who carry a National Recognised Unit of Competency.