(a) A vehicle subject to this chapter shall be equipped and maintained as required by this section to prevent loose material from escaping by blowing or spilling.
(b) A vehicle bed carrying a load:
(1) may not have a hole, crack, or other opening through which loose material can escape; and
(2) shall be enclosed:
(A) on both sides by side panels;
(B) on the front by a panel or the vehicle cab; and
(C) on the rear by a tailgate or panel.

(c) Except as provided by Subsection (e), the load shall be covered and the covering firmly secured at the front and back, unless the load:
(1) is completely enclosed by the load-carrying compartment; or
(2) does not blow from or spill over the top of the load-carrying compartment.
(d) The tailgate of the vehicle shall be securely closed to prevent spillage during transportation.
(e) If the vehicle is a commercial motor vehicle transporting loose material, the load shall be covered and the covering firmly secured at the front and back or shall be completely enclosed by the load-carrying compartment. For purposes of this section, “commercial motor vehicle” means a motor vehicle, trailer, or semitrailer used primarily in the business of transporting property.