Indicates whether a school bus or motor vehicle functioning as a school bus for a school-related purpose is involved in the crash. The “school bus? with or without a passenger on board, must be directly involved as a contact motor vehicle or indirectly involved as a non-contact motor vehicle (children struck when boarding or alighting from the school bus, two vehicles colliding as the result of the stopped school bus, etc.).
Important in determining where and how school children are at the greatest risk of injury when being transported by a school bus and the extent to which school bus operations affect overall traffic safety.