Section 575IAC1-9-83. Windshield and windows

   (a) Other than emergency exits designated to comply with FMVSS No. 217, Bus Emergency Exits and Window Retention and Release, each side window, with the exception of the last window on each side, which may be fixed, must provide an unobstructed opening of at least nine (9) inches high (but not more than thirteen (13) inches high) and at least twenty-two (22) inches wide, obtained by lowering the window. One (1) window on each side of the bus may be less than twenty-two (22) inches wide.

  (b) Emergency windows must not be placed immediately adjacent to any side emergency door. Equal spacing of the emergency window exits, to the extent practical, must be maintained.

  (c) Vertically hinged emergency windows must be hinged on the forward side of the window to prevent whipping in the case of an accidental release while the bus is in motion, with the latch mechanism located on the opposite side, midway on the window.

  (d) Windshields must comply with federal, state, and local regulations.

  (e) With the exception of Type A buses, windshields must have a horizontal gradient band starting from slightly above the line of the driver's vision and gradually decreasing in light transmission to twenty percent (20%) or less at the top of the windshield.

  (f) Tinted glazing or frost-free glazing, or both, may be installed in all doors or windows, but must comply with IC 9-19-19-4(c). No person may drive any motor vehicle that has a:

(1) windshield;

(2) side wing; or

(3) side window;

that is part of a front door and is tinted to the extent, or manufactured in such a way, that the occupants of the vehicle cannot be easily identified through that window.

Table 1
Buses with Rear Emergency Doors (All Front Engine Buses)
Available Combinations by Capacity	Manufacturer's Equipped Capacity	Must Have	And Must Also Have
		Roof Hatch	Left Side Emergency Exit Windows	Right Side Emergency Exit Windows	Left Side Emergency Exit Door
1 – 45	1 – 45	1	1	1	0
46 – 77	46 – 77	2	2	2	0
	46 – 77	2	1	1	1
78 – 93	78 – 93	2	3	3	0
	78 – 93	2	2	2	1
Table 2
Buses with Rear Push-Out Window and Left Side Emergency Door (All Rear-Engine Buses)
Available Combinations by Capacity	Manufacturer's Equipped Capacity	Must Have	And Must Also Have
		Roof Hatch	Left Side Emergency Exit Windows	Right Side Emergency Exit Windows	Right Side Emergency Exit Door
1 – 45	1 – 45	1	1	1	0
46 – 89	46 – 89	2	2	2	0
	46 – 89	2	1	1	1
90 – 105	90 – 105	2	3	3	0
	90 – 105	2	2	2	1

(State School Bus Committee; 575 IAC 1-9-83; filed Aug 15, 2014, 10:20 a.m.: 20140910-IR-575130244FRA)