Oklahoma Code § 47-11-406

Title 47. Motor Vehicles: Farm tractors or implements - Operation on highways -
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Permission from Department required - Wide vehicles - Duty of
operator - Yield of right-of-way.
A.  A farm tractor, as defined in Section 1-118 of this title,
or any implement of husbandry, as defined in Section 1-125 of this
title, except trailers and semitrailers when operated in accordance
with statutory limits or provisions of Section 14-101 of this title,
shall not be permitted to travel upon any highway in this state
which is a part of the National System of Interstate and Defense
Highways.  However, the Department of Public Safety shall have the
authority to permit such travel in certain geographic areas of the
state as deemed necessary.  Such tractor or implement may be
operated on any other roadway in this state if the operator has
attached all the safety devices required by law and has taken
reasonable steps to reduce the width of the tractor or implement as
provided for by the manufacturer.  Whenever the width of a farm
tractor or implement of husbandry exceeds the width of that portion
of a roadway on which the tractor or implement is driven, which is

marked as a single lane of traffic, or, if the roadway has not been
marked for lanes of traffic and the width of the tractor or
implement exceeds more than fifty percent (50%) of the width of the
roadway, the operator shall move the tractor or implement, as soon
as possible, as far to the right-hand side of the roadway as is
practicable and safe upon approach of any oncoming or following
vehicle and upon approaching the crest of a hill.
B.  Upon the immediate approach of a farm tractor or implement
of husbandry which cannot be moved by the operator thereof to the
far right-hand side of the roadway, as required in subsection A of
this section, due to the existence of any bridge or guardrail, sign
or any other physical impediment which would not safely allow such
tractor or implement to travel on the far right-hand side of the
road, the driver of every other vehicle shall yield the right-of-way
and shall immediately pull over to the far right-hand side of the
road and remain in such position until the tractor or implement has
passed.
C.  This section shall not operate to relieve any operator of a
farm tractor or implement of husbandry from the duty to drive with
due regard for the safety of all persons using the roadway.

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