Australian Carriers also have this Red/Blue taillight arrangement. The Carriers also had Blue lenses in the Head lamps, so one could speculate (from Railway practice) that the colour of the tail lamps was changed when changing direction of travel, that is when travelling forward at night blue lights would be shown at the front and red at the rear, but when reversing, the rear lamps would be blue to indicate the vehicle is coming towards you, possibly also showing more light on the ground to assist in the movement.
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