(a) “School bus.” Every bus designed for carrying more than nine passengers which is owned by a public, private or governmental agency or institution of learning, and operated for the transportation of children to or from a school session or a school function, or owned by a private person and operated for compensation for the transportation of children to or from a school session or a school function; provided, “school bus” does not include a bus operated by a municipally owned transportation system, a mass transit company operating exclusively within the territorial limits of a municipality, or within those limits and the territorial limits of municipalities immediately contiguous to the municipality, nor a common passenger carrier certified by the Public Utilities Commission unless the bus is devoted exclusively to the transportation of children to and from a school session or a school function, and “school bus” does not include a van or bus used by a licensed child care center or type A family child care home to transport children from the child care center or type A family child care home to a school if the van or bus does not have more than 15 children in the van or bus at any time.
(R.C. § 4511.01(F))
(b) "Children's bus" means every motor vehicle, other than a school bus, designed for carrying more than five passengers which is operated for the transportation of children to or from children's camps, nursery schools, instruction classes, Y.M.C.A. or Y.W.C.A. camps or centers or other places where children congregate for instruction, health, care, recreation or entertainment.
(c) "School bus" or "children's bus bearing the prescribed warning marking" means a school bus or children's bus which is painted national school bus chrome number two and is marked, or bears a sign on a background of national school bus chrome number two, on both front and rear with the words "school bus", "camp bus", "children's bus", "Y.M.C.A. bus" or other similar designation indicating that such bus normally transports children, in black lettering not less than eight inches in height and on the rear of the bus with the word "STOP" in black lettering not less than ten inches in height.