When a vehicle subject to this chapter is being operated upon a highway for purposes other than the actual transportation of school children to or from school or in connection with school activities, the words "SCHOOL BUS" or "SCHOOL STUDENTS" shall be removed or covered. During this operation, flashing visual signals may not be actuated. The transportation of school children shall include driving the vehicle from the school, garage or other place of storage to the point where the first child is picked up, and from the place where the last child is discharged to the school, garage or other place of storage.
67 Pa. Code § 171.143
The provisions of this §171.143 amended under the Vehicle Code, 75 Pa.C.S. §§ 4103, 4551-4553 and 6103.