Motor vehicles are designed and built to fulfil a transport function with the user expecting trouble free service. However, breakdowns occur on average once per year and the user requires technical assistance to make the vehicle mobile. Breakdown is related to climatic conditions, driver error or neglect, vehicle reliability and durability. An Emergency Breakdown Service organisation must provide service personnel skilled in fault diagnosis and rectification, and it must train its personnel to service new technology as it is introduced. A sophisticated communication system is required to direct service units to immobilised vehicles.