While the Board offers, as needed, a system of student transportation, it also requires parents of students to accept responsibility for supervision until the child boards the bus in the morning and after the child leaves the bus at the end of the school day. Students must obey all instructions given by the driver and all school and Board policies while riding the bus. Students cannot leave the bus except at their regular stop without written permission from a parent and an administrator. Only at the time that a child boards the bus does he/she become the responsibility of the school district. such responsibility shall end when the child is discharged at the regular bus stop at the end of the school day. When a child does not conduct himself/herself properly on a bus, the bus driver will write a referral or bring him/her to the building principal, who may inform the parents of the misconduct and behavior. The principal or his designee will also discipline students as deemed appropriate. A child who becomes a serious disciplinary problem on the school bus may have his transportation privileges suspended or terminated. In such cases, the parents of the child involved will become responsible for transporting their child to and from school.