Texas Transportation Code - Section 541.201

§ 541.201.  VEHICLES.  In this subtitle:

(4)  "Farm tractor" means a motor vehicle designed and used primarily as a farm implement to draw an implement of husbandry, including a plow or a mowing machine.

(5)  "House trailer" means a trailer or semitrailer, other than a towable recreational vehicle, that:
        (A)  is transportable on a highway in one or more sections;
        (B)  is less than 40 feet in length, excluding tow bar, while in the traveling mode;
        (C)  is built on a permanent chassis; 
        (D)  is designed to be used as a dwelling or for commercial purposes if connected to required utilities;  and
        (E)  includes plumbing, heating, air-conditioning, and electrical systems.

(13)  "Pole trailer" means a vehicle without motive power:                 
        (A)  designed to be drawn by another vehicle and secured to the other vehicle by pole, reach, boom, or other security device;  and
        (B)  ordinarily used to transport a long or irregularly shaped load, including poles, pipes, or structural members, generally capable of sustaining themselves as beams between the supporting connections.

(14)  "Road tractor" means a motor vehicle designed and used to draw another vehicle but not constructed to carry a load independently or a part of the weight of the other vehicle or its load.

(17)  "Semitrailer" means a vehicle with or without motive power, other than a pole trailer:
        (A)  designed to be drawn by a motor vehicle and to transport persons or property;  and
        (B)  constructed so that part of the vehicle's weight and load rests on or is carried by another vehicle.

(18)  "Special mobile equipment" means a vehicle that is not designed or used primarily to transport persons or property and that is only incidentally operated on a highway.  The term:
        (A)  includes ditchdigging apparatus, well boring apparatus, and road construction and maintenance machinery, including an asphalt spreader, bituminous mixer, bucket loader, tractor other than a truck tractor, ditcher, levelling grader, finishing machine, motor grader, road roller, scarifier, earth-moving carryall and scraper, power shovel or dragline, or self-propelled crane and earth-moving equipment;  and
        (B)  excludes a vehicle that is designed to transport persons or property and that has machinery attached, including a house trailer, dump truck, truck-mounted transit mixer, crane, and shovel.

(19)  "Towable recreational vehicle" means a nonmotorized vehicle that:    
        (A)  is designed:     
                (i)  to be towable by a motor vehicle;  and 
                (ii)  for temporary human habitation for uses including recreational camping or seasonal use;
        (B)  is permanently built on a single chassis;     
        (C)  may contain one or more life-support systems;  and    
        (D)  may be used permanently or temporarily for advertising, selling, displaying, or promoting merchandise or services, but is not used for transporting property for hire or for distribution by a private carrier.

(20)  "Trailer" means a vehicle, other than a pole trailer, with or without motive power:
        (A)  designed to be drawn by a motor vehicle and to transport persons or property;  and
        (B)  constructed so that no part of the vehicle's weight and load rests on the motor vehicle.

(22)  "Truck tractor" means a motor vehicle designed and used primarily to draw another vehicle but not constructed to carry a load other than a part of the weight of the other vehicle and its load.

Acts 1995, 74th Leg., ch. 165, § 1, eff. Sept. 1, 1995.  Amended by Acts, 75th Leg., ch. 1020, § 1, eff. Sept. 1, 1997;  Acts 1997, 75th Leg., ch. 1438, § 8, eff. Sept. 1, 1997;  Acts 1999, 76th Leg., ch. 663, § 1, eff. June 18, 1999;  Acts 1999, 76th Leg., ch. 797, § 3, eff. Sept. 1, 1999;  Acts 2001, 77th Leg., ch. 1085, § 5, eff. Sept. 1, 2001;  Acts 2003, 78th Leg., ch. 1318, § 2, eff. Sept. 1, 2003;  Acts 2003, 78th Leg., ch. 1276, § 14A.833, eff. Sept. 1, 2003.