Vertical orientation. the vertical inclination of the headlamp shall be set according the procedure described in the paragraphs 6.2.5.1. through 6.2.5.4. of this Regulation. 6.18.5.2. Headlamp levelling system 6.18.5.2.1. In the case where a headlamp levelling device is necessary to satisfy the requirements of paragraph 6.18.5.1., the device shall be automatic. 6.18.5.2.2. In the event of a failure of this device, the passing beam shall not assume a position in which the dip is less than it was at the time when the failure of the device occurred.
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Sources: Agreement Concerning the Adoption of Harmonized Technical United Nations Regulations for Wheeled Vehicles, Agreement Concerning the Adoption of Harmonized Technical United Nations Regulations for Wheeled Vehicles