Wisconsin Code § 347.46

Fenders and mudguards
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(1) No person shall operate a vehicle of the tractor type on a highway unless the driving
wheels of such vehicle are protected by suitable fenders.
(2) No person shall operate on a highway in intercity movement any privately owned motor truck or privately owned semitrailer drawn by a truck tractor, except those motor trucks and
semitrailers equipped with dump bodies, unless such motor truck
or semitrailer is equipped with rear fenders or mudguards of such
material and so constructed and placed as to restrict to a minimum the splashing of water, mud or other material which may be
thrown by the rear wheels. Such rear fenders or mudguards shall
meet the following minimum specifications:
(a) The fenders or mudguards shall cover the tire or multiple
tires they are protecting starting at the top from a line drawn vertically through the center of the axle and extending rearward and
downward so that the fender or mudguard under any condition of
operation or loading of the vehicle has a ground clearance of not
more than one third of the horizontal distance from the center of
the rearmost axle to the fender or mudguard;
(b) The fenders or mudguards shall be at least as wide as the
tire or multiple tires they are protecting;
(c) If the vehicle is so designed and constructed that the rear
wheels are covered in the manner specified in pars. (a) and (b) by
means of fenders, body construction or other means of enclosure,
then no special mudguards are required. Otherwise, the vehicle
shall be equipped with special mudguards to the extent necessary
to meet the requirements of pars. (a) and (b).

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