Section 90(2) in The Central Motor Vehicles Rules, 1989
(2)A board with the inscription National permit valid in the State(s) of with blue letters on white background shall be carried in front top of [such vehicles other than a trailer or modular hydraulic trailer for which the same shall appear on both sides of the vehicle] [Inserted by Notification No. G.S.R. 212 (E) dated 20.3.2015 (w.e.f. 1.4.2015)].
