Sec. 489(51). Requirements as to head lamps.
(a) The head lamps of motor vehicles shall be so constructed,
arranged, and adjusted that they will at all times mentioned in
subsection forty-nine and under normal atmospheric conditions
produce a driving light sufficient to render clearly discernible a
person two hundred feet ahead, but shall not project a glaring or
dazzling light to persons in front of such head lamps.
(b) Head lamps shall be deemed to comply with the foregoing
provisions prohibiting glaring and dazzling lights if none of the
main portion of the head lamp beam rises above a horizontal
plane passing through the lamp centers parallel to the level road
upon which the loaded vehicle stands and in no case higher than
forty-two inches, seventy-five feet ahead of the vehicle.
(c) Whenever a vehicle is being operated upon a highway or
portion thereof which is sufficiently lighted to reveal any person
upon the highway at a distance of two hundred feet ahead of
such vehicle it shall be permissible to dim the head lamps or to
tilt the main beams of light thereof downward or such head
lamps may be extinguished provided such vehicle is equipped
with two lighted side lamps projecting a light to the front of such
vehicle and which comply with the rules and regulations of the
commissioner.
