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.