Wisconsin Code § 347.13

Tail lamps and registration plate lamps
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(1)
No person may operate a motor vehicle, mobile home, or trailer

or semitrailer upon a highway during hours of darkness or during
a period of limited visibility unless the motor vehicle, mobile
home, or trailer or semitrailer is equipped with at least one tail
lamp mounted on the rear which, when lighted during hours of
darkness, emits a red light plainly visible from a distance of 500
feet to the rear. No tail lamp may have any type of decorative covering that restricts the amount of light emitted when the tail lamp
is in use. No vehicle originally equipped at the time of manufacture and sale with 2 tail lamps may be operated upon a highway
during hours of darkness or during a period of limited visibility
unless both lamps are in good working order. This subsection
does not apply to any type of decorative covering originally
equipped on the vehicle at the time of manufacture and sale.
(2) Every tail lamp on a vehicle shall be located at a height of
not more than 72 inches nor less than 20 inches.
(3) No person shall operate on a highway during hours of
darkness any motor vehicle upon the rear of which a registration
plate is required to be displayed unless such motor vehicle is
equipped with a lamp so constructed and placed as to illuminate
with a white light the rear registration plate and render it clearly
legible from a distance of 50 feet to the rear. Such lamp may be
incorporated as part of a tail lamp or may be a separate lamp.
(4) Tail lamps and registration plate lamps shall be so wired
as to be lighted whenever the headlamps or auxiliary driving
lamps are lighted. In a tractor-semitrailer combination, 2
switches may be employed, one to activate semitrailer lamps and
one to activate tractor lamps.

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