Tex. Transportation Code § 547.352: ADDITIONAL LIGHTING EQUIPMENT REQUIREMENTS.

In addition to other equipment required by this chapter:

(1) a bus, truck, trailer, or semitrailer that is at least 80 inches wide shall be equipped with:

(A) two clearance lamps on the front, one at each side;

(B) two clearance lamps on the rear, one at each side;

(C) four side marker lamps, one on each side at or near the front and one on each side at or near the rear;

(D) four reflectors, one on each side at or near the front and one on each side at or near the rear; and

(E) hazard lamps that meet the requirements of Section 547.331;

(2) a bus or truck that is at least 30 feet long shall be equipped with hazard lamps that meet the requirements of Section 547.331;

(3) a trailer or semitrailer that is at least 30 feet long shall be equipped with:

(A) two side marker lamps, one centrally mounted on each side with respect to the length of the vehicle;

(B) two reflectors, one centrally mounted on each side with respect to the length of the vehicle; and

(C) hazard lamps that meet the requirements of Section 547.331;

(4) a pole trailer shall be equipped with:

(A) two side marker lamps, one at each side at or near the front of the load;

(B) one reflector at or near the front of the load;

(C) one combination marker lamp that:

(i) emits an amber light to the front and a red light to the rear and side; and

(ii) is mounted on the rearmost support for the load to indicate the maximum width of the trailer; and

(D) hazard lamps that meet the requirements of Section 547.331, if the pole trailer is at least 30 feet long or at least 80 inches wide;

(5) a truck-tractor shall be equipped with:

(A) two clearance lamps, one at each side on the front of the cab; and

(B) hazard lamps that meet the requirements of Section 547.331, if the truck-tractor is at least 30 feet long or at least 80 inches wide; and

(6) a vehicle at least 80 inches wide may be equipped with:

(A) not more than three front identification lamps without glare; and

(B) not more than three rear identification lamps without glare.

Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.