Section 124(2) in The Orissa Motor Vehicles Rules, 1993
(2)A public service vehicle when regularly used for carrying Government Mail by, or under a contract with the Indian Posts and Telegraphs Department, may exhibit in a conspicuous place upon a plate or a plane surface of the Motor Vehicle the words "MAIL" in red colour on a white ground each letter being not less than fifteen centimetres in height and of a uniform thickness of two centimetres.
