Chapter 6.5. Motor Carrier Safety * Article 8. General Equipment Requirements Mirrors on School Buses.
All Type 1 school buses and Type 2 school buses constructed on and after July 1, 1970, shall be equipped with two exterior rearview mirrors, one on each side of the bus. Every school bus shall be equipped with a cross-view mirror mounted on the front exterior of the bus to provide the seated driver with a clear view of the area directly in front of the bus.
(a) Size of Rearview Mirrors. Type 1 school buses constructed after January 1, 1965, and Type 2 school buses constructed after April 1, 1977, shall have exterior side mounted rearview mirrors, each with at least 50 sq in. in the reflective area.
(b) Size of Cross View Mirrors. All front exterior crossview mirrors required on Type 1 school buses shall have at least 40 sq in. in the reflective area