Indiana Code Title 9. Motor Vehicles § 9-21-5-14

Sec. 14. (a) A person may not operate a school bus or a special purpose bus at a speed greater than:

(b) If the posted speed limit is lower than the absolute limits set in this section or if the absolute limits do not apply, the maximum lawful speed of a bus is the posted speed limit.

(c) A person who knowingly or intentionally exceeds a speed limit set forth in subsection (a) or (b) commits a Class C misdemeanor.