As used in this subchapter, unless the context otherwise requires, “church bus” means any bus or van which:
(1) Is used to transport people to or from any church or church function;
(2) Has a sign on the front and rear of such bus or van with the words “CHURCH BUS” written in letters of not less than eight inches (8") in height;
(3) Is equipped with flasher lights to indicate that the bus or van is receiving or discharging its passengers; and
(4) Is of a color other than school bus yellow.