Section 130(3) in The Haryana Motor Vehicles Rules, 1993
(3)Every goods carriage or tractor trailer combination shall be furnished with efficient means of communication to enable the cleaner or conductor to signal the driver to stop the vehicle or to caution to allow passage for faster moving vehicle. The connection of the communication bell shall be of adopter and socket type so that the communication bell could be connected and disconnected while coupling and discoupling the trailer.
