(a) Every authorized emergency vehicle may be equipped with a system which flashes
the upper-beam headlamps of the vehicle with the flashes occurring alternately from
the front headlamp on one side of the vehicle to the front headlamp on the other side
of the vehicle. The flashing of the headlamps shall consist only of upper-beam flashing, and not
the flashing of any other light beam.
(b) “Upper-beam headlamp,” as used in this section, means a headlamp or that part
of a headlamp which projects a distribution of light, or composite beam, so aimed
and of such intensity as to reveal persons and vehicles at a distance of at least
350 feet ahead for all conditions of loading.
(c) The system provided for in subdivision (a) shall only be used when an authorized
emergency vehicle is being operated pursuant to Section 21055.
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