Section 17C-15-21 - Same - Use of; dimming lights upon approaching or overtaking(a) Whenever a motor vehicle is being operated on a roadway or shoulder adjacent thereto during the times specified in section two, 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:(b) Whenever a driver of a vehicle approaches an oncoming vehicle within five hundred feet, such 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 twenty, subdivision (b) shall be deemed to avoid glare at all times, regardless of road contour and loading.(c) Whenever the driver of a vehicle follows another vehicle within two hundred feet to the rear, except when engaged in the act of overtaking and passing, such driver shall use a distribution of light permissible under this chapter other than the uppermost distribution of light specified in subdivision (a) of section twenty.