(A) Each school bus purchased as a new vehicle after December 31, 1975 shall be equipped with an eight-lamp flashing signal system. Until December 31, 1978, all other school buses shall be equipped with either a four-lamp or an eight-lamp flashing signal system. After December 31, 1978, all school buses shall be equipped with an eight-lamp flashing signal system.
(B) A four-lamp flashing signal system shall have two alternately flashing red lamps mounted as high and as widely spaced laterally on the same level as practicable at the front of the school bus, and two alternately flashing red lamps mounted in the same manner at the rear.
(C) An eight-lamp flashing signal system shall have, in addition to a four-lamp system, four alternately flashing amber lamps. Each amber lamp shall be mounted next to a red lamp and at the same level but closer to the center line of the school bus.
(D) Each signal lamp shall be a sealed beam at least five and one-half inches in diameter, and shall have sufficient intensity to be visible at 500 feet in normal sunlight. Both the four-lamp and eight-lamp system shall be actuated only by means of a manual switch. There shall be a device for indicating to the driver that the system is operating properly or is inoperative.
(E) A school bus may also be equipped with alternately flashing head lamps, which may be operated in conjunction with the eight-lamp flashing signal system.
(ILCS Ch. 625, Act 5, § 12-805) Penalty, see § 70.999