a) the harmonisation of relevant road traffic and safety legislation; b) control measures in respect of vehicles, drivers and traffic operations; and c) the harmonisation and implementation of relevant technical standards. ARTICLE 6.3 FITNESS OF VEHICLES 1. Member States shall ensure acceptable harmonised levels of vehicle fitness in the Region. 2. Member States shall develop and implement a harmonised vehicle fitness system which shall entail harmonised standards in respect of - a) vehicle testing, including vehicle categories to be tested, the frequency of testing and testing procedures; b) testing stations and testing equipment, including certification, inspection and calibration; c) vehicle examiners, including training and certification; and d) vehicle fitness standards. 3. Member States shall require roadworthy certification and/or vehicle fitness certification in respect of all vehicles in their territories as proof that vehicles have undergone the required tests. 4. Member States shall develop a common format for roadworthy certification and vehicle fitness certification. 5. A Member State shall recognise the roadworthy certification and/or vehicle fitness certification issued in another Member State in respect of a vehicle registered in such State for the purposes of the free movement of such vehicle within its territory: Provided that a Member State shall retain the right of scrutiny to prevent the use of falsified documentation. 6. Member States agree that, with the exception of the Republic of Angola, they shall phase out the registration of left-hand vehicles; provided that left-hand vehicles registered prior to the termination of registration of such vehicles shall be permitted to continue operating thereafter. ARTICLE 6.4 SAFETY STANDARDS OF VEHICLES ANDEQUIPMENT ON OR IN RESPECT OF VEHICLES 1. Member States shall adopt and implement harmonised regulations on vehicle safety and equipment on or in respect of vehicles, as well as markings on vehicles, and for this purpose, Member States who have not yet acceded to the Agreement Concerning the