Tex. Transportation Code § 545.426: OPERATION OF SCHOOL BUS.

(a) A person may not operate a school bus if:

(1) the door of the school bus is open; or

(2) the number of passengers on the bus is greater than the manufacturer's design capacity for the bus.

(b) An operator of a school bus, while operating the bus, shall prohibit a passenger from:

(1) standing in the bus; or

(2) sitting:

(A) on the floor of the bus; or

(B) in any location on the bus that is not designed as a seat.

(c) The department may adopt rules necessary to administer and enforce this section.

Added by Acts 2007, 80th Leg., R.S., Ch. 923 (H.B. 3190), Sec. 5, eff. September 1, 2007.