24:06:07:06Windows,
Section · Administrative Rules of South Dakota · View on sdlegislature.gov ↗
windshield, and glass. All window openings and glass in the windows and doors of a school bus must comply with the section entitled "Windows" on page 66, Section A of the National School Transportation Specifications & Procedures, May 2015 Revised Edition. In addition, the following provisions apply: (1) The driver's window, the first window on the left after the driver's window, the first window after the service door, and the windows in the service door must be frost-free (thermal) glass on Types B, C, and D buses; and (2) The lower portion of the rear emergency door on Type A-2, B, C, and D buses must have an exposed glass area of not less than 350 square inches and must be covered by a protective screen inside.
Source: 22 SDR 61, effective November 9, 1995; 30 SDR 181, effective May 20, 2004; 33 SDR 152, effective April 5, 2007; 38 SDR 58, effective October 17, 2011; 44 SDR 43, effective September 13, 2017.