Section 90(4) in The Central Motor Vehicles Rules, 1989
(4)The vehicle shall have a minimum of two drivers and shall be provided with a seat across its full width behind the drivers seat providing facility for the spare driver to stretch himself and sleep:[Provided that this sub-rule shall apply to light motor vehicle and medium goods vehicles only from a date to be notified by the Central Government.] [Inserted by GSR 338(E), dated 26.3.1993 (w.e.f. 26.3.1993).]
