California
Vehicle Code – VC 36102
(a) An automatic bale wagon operated unladen on a highway.
(b) An automatic bale wagon when transporting baled hay or straw for a distance of not more than five continuous road miles on a highway from one parcel of property owned, leased, or controlled by a farmer to another parcel of property owned, leased, or controlled by such farmer.
(c) A motor vehicle which is designed for, and used exclusively to, haul feed for livestock and which is owned and operated exclusively by a farmer or an employee of a farmer. A vehicle exempted by this subdivision may be operated only on those highways that are maintained by local authorities, only pursuant to a permit issued as provided in Section 35780 by the local authority having jurisdiction over the highways used, and only for a distance of not more than five continuous road miles from one parcel of property owned, leased, or controlled by the farmer to another parcel of property owned, leased, or controlled by the farmer. This subdivision does not apply to transportation for compensation.