Tex. Transportation Code § 522.004

(a) This chapter does not apply to:

(1) a vehicle that is controlled and operated by a farmer and:

(A) used to transport agricultural products, farm machinery, or farm supplies to or from a farm;

(B) used within 150 miles of the person's farm; and

(C) not used in the operations of a common or contract motor carrier;

(2) a fire-fighting or emergency vehicle necessary to the preservation of life or property or the execution of emergency governmental functions, whether operated by an employee of a political subdivision or by a volunteer fire fighter;

(3) a military vehicle or a commercial motor vehicle, when operated for military purposes by military personnel, including:

(A) active duty military personnel, including personnel serving in the United States Coast Guard; and

(B) members of the reserves and national guard on active duty, including personnel on full-time national guard duty, personnel engaged in part-time training, and national guard military technicians;

(4) a recreational vehicle that is driven for personal use;

(5) a vehicle that is owned, leased, or controlled by an air carrier, as defined by Section 21.155, and that is driven or operated exclusively by an employee of the air carrier only on the premises of an airport, as defined by Section 22.001, on service roads to which the public does not have access;

(6) a vehicle used exclusively to transport seed cotton modules or cotton burrs;

(7) a vehicle, including a vehicle described by Section 504.502(i), that is:

(A) operated intrastate; and

(B) driven by an individual not for compensation and not in the furtherance of a commercial enterprise; or

(8) a covered farm vehicle as defined by 49 C.F.R. Section 390.5.

(b) In this section, "recreational vehicle" means a motor vehicle primarily designed as temporary living quarters for recreational camping or travel use. The term includes a travel trailer, camping trailer, truck camper, and motor home.