A type A, B, C, or D school bus must be equipped with at least one stop-signal arm, prewarning flashing amber signals, and flashing red signals.
In addition to equipment required under subdivision 1, and notwithstanding section 169.64, a school bus may be equipped with a driver-activated, exterior student-control, warning system. The driver shall activate this system when the use of the stop-signal arm and flashing red signals is required under section 169.443, subdivision 1.
(a) Notwithstanding section 169.55, subdivision 1, or 169.57, subdivision 3, paragraph (b), or other law to the contrary, a school bus that is subject to and complies with the equipment requirements of subdivision 1 and section 169.441, subdivision 1, or a Head Start bus that is not a type III vehicle defined in section 169.011, subdivision 71, may be equipped with a flashing strobe lamp. The lamp may be used only as provided in this subdivision.
(b) The lamp must be permanently mounted on the longitudinal centerline of the bus roof not less than two feet forward of the rear roof edge.
(c) The strobe lamp may be lighted only when atmospheric conditions or terrain restrict the visibility of school bus lamps and signals or Head Start bus lamps and signals so as to require use of the bright strobe lamp to alert motorists to the presence of the school bus or Head Start bus. A strobe lamp may not be lighted unless the school bus or Head Start bus is actually being used as a school bus or Head Start bus.