Sec. 4. A bus used to transport school children must be equipped as follows:
(1) At least two (2) signal lamps mounted as high and as widely spaced laterally as practicable, capable of displaying the front two (2) alternately flashing red lights located at the same level, and having sufficient intensity to be visible at five hundred (500) feet in normal sunlight.
(2) As required by the state school bus committee under IC 20-27-3-4.
(3) As required by IC 20-27-9.