Section 128(7) in The Central Motor Vehicles Rules, 1989
(7)Windows.Windows of tourist vehicles should have a minimum space of 14.25 millimetres and shall be of safety or laminated safety glass.Windows shall be of double sliding type slider running smoothly in channels without rattle. All safety or laminated safety glasses used for windows should conform to standards laid down by the Bureau of Indian Standards. Windows shall be provided with sliding curtains.
