To warn adjacent vehicle operators and pedestrians of a vehicle's rearward motion, and to provide illumination to the rear when backing up,each vehicle must be equipped with one or two rear-mounted, rear-facing reversing(or "backup") lamps.These are required to produce white light by US and international UN Regulations.However, some countries have at various times permitted amber reversing lights. In Australia and New Zealand, for example, vehicle manufacturers were faced with the task of localising American cars originally equipped with combination red brake/turn signal lamps and white reversing lights. Those countries' regulations permitted the amber rear turn signals to burn steadily as reversing lights, so automakers and importers were able to combine the (mandatorily amber) rear turn signal and (optionally amber) reversing light function, and so comply with the regulations without the need for additional lighting devices. Both countries now require white reversing lights, and the combination amber turn/reverse light is no longer permitted on new vehicles.The US state of Washington currently permits reversing lamps to emit white or amber light.
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