(a) In this section, “farm tractor” and “implement of husbandry” have the meanings assigned by § 541.201.
(b) The width limitation provided by § 621.201 does not apply to:
(1) highway building or maintenance machinery that is traveling:
(A) during daylight on a public highway other than a highway that is part of the national system of interstate and defense highways; or
(B) for not more than 50 miles on a highway that is part of the national system of interstate and defense highways;
(2) a vehicle traveling during daylight on a public highway other than a highway that is part of the national system of interstate and defense highways or traveling for not more than 50 miles on a highway that is part of the national system of interstate and defense highways if the vehicle is:
(A) a farm tractor or implement of husbandry; or
(B) a vehicle on which a farm tractor, implement of husbandry, or equipment used in the harvesting and production of timber, other than a tractor, implement, or equipment being transported from one dealer to another, is being moved by the owner of the tractor, implement, or equipment or by an agent or employee of the owner:
(i) to deliver the tractor, implement, or equipment to a new owner;
(ii) to transport the tractor, implement, or equipment to or from a mechanic for maintenance or repair; or
(iii) in the course of an agricultural or forestry operation;
(3) machinery that is used solely for drilling water wells, including machinery that is a unit or a unit mounted on a conventional vehicle or chassis, and that is traveling:
(A) during daylight on a public highway other than a highway that is part of the national system of interstate and defense highways; or
(B) for not more than 50 miles on a highway that is part of the national system of interstate and defense highways;
(4) a vehicle owned or operated by a public, private, or volunteer fire department;
(5) a vehicle registered under § 502.431; or
(6) a recreational vehicle to which § 622.903 applies.