This Regulation applies to: 1.1. Approval of devices for reversing safety defined in Part I intended to be fitted to vehicles of category M and N. 1.2. Approval of vehicle installation of devices for reversing safety defined in Part II if fitted to vehicles of category M and N. 1.3. At the request of the manufacturer, Contracting Parties may grant approvals under Parts I and II to vehicles of other categories and devices for fitting to such vehicles. 1.4. The following vehicles of category M and N shall be exempted from this Regulation: Vehicles where installation of any device for reversing safety is incompatible with their on-road use may be partly or fully exempted from this Regulation, subject to the decision of the Type Approval Authority. 1.5. If a vehicle has multiple device(s), the manufacturer shall designate the device that meets the provisions of the regulation.