Either the rear lamp or a separate lamp shall be so constructed and placed as to illuminate with a white light the rear registrationplateand render itclearly legiblefrom a distanceof fifty feet to the rear. When the rear registration plate is illuminated by an electric lamp other than the requiredrear lamp, thetwo lamps shall be turned on or off onlyby the samecontrol switch at alltimes when headlamps are lighted. This section does not apply to commercial vehicles engaged exclusively in intrastate commerce that are dump trucks or that are used exclusively for themovement of construction materials and equipment to and from construction projects. [S13, §1571-m17; C24, 27, 31, 35, §5045; C39, §5033.08; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §321.388]
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