1. Whenever a motor vehicle is being operated on a roadway or shoulder during the times specified in section 321.384, the driver shall use a distribution of light, or composite beam, directed high enough and of sufficient intensity to reveal persons and vehicles at a safe distance in advance of the vehicle, subject to the following requirements and limitations: a. Whenever a driver of a vehicle approaches an oncoming vehicle within one thousand feet,the driver shall use a distribution of light, or composite beam, so aimed that the glaring rays are not projected into the eyes of the oncoming driver. The lowermost distribution of light,or composite beam, specified in section 321.409, subsection 1,paragraph “b”, shall be deemed to avoid glare at alltimes, regardless of road contour and loading. b. Whenever the driver of a vehicle follows another vehicle within four hundred feet to the rear, except when engaged in the act of overtaking and passing, the driver shall use a distribution of light permissible under this chapter other than the uppermost distribution of light specified in section 321.409, subsection 1, paragraph “a”. 2. The provisions of subsection 1, paragraphs “a” and “b”, do not apply to motorcycles or motorized bicycles being operated between sunrise and sunset.
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