Sec. 16. (a) When a school bus is in motion, students are prohibited from occupying any space forward of a vertical plane drawn through the rear of the driver's seat and perpendicular to the longitudinal axis of the bus. Every school bus must:
(1) be marked with a line or otherwise equipped in order to indicate the prohibited area to students; and
(2) have clearly posted, at or near the front of the bus, a sign stating that it is a violation of Indiana law for a school bus to be operated with any students occupying the prohibited area.
(b) A school bus driver who knowingly or intentionally violates this section commits a Class C misdemeanor.