Section 102(4) in The Central Motor Vehicles Rules, 1989
(4)[ In the case of modular hydraulic trailer,-(i)the intention to stop shall be indicated by two electrical stop lamps which shall be red in color and shall be fitted one each on left and right hand sides at the rear of the vehicle;(ii)the stop lamps shall light up on the actuation of the service brake control of the puller tractor;(iii)at least two direction indicators of amber colour shall be fitted, which are illuminated to indicate intention to turn by a light and the minimum illuminated area of each indicator shall be 60 sq.cm.]
