Section 251(3) in The West Bengal Motor Vehicles Rules, 1989
(3)Save as contained in sub-rules (1) and (2). no motor vehicle owned by any person not being a person holding a contract with the Indian Posts and Telegraphs Department for carrying Government Mail shall be pained in red or similar other colour nor shall any such vehicle display any sign or inscription which includes the word "Mail" :Provided that the prohibition under this sub-rule relating to painting motor vehicles in red or similar other colour shall not apply to motor vehicles belonging to the Fire Brigade or the Government of West Bengal or to any vehicle belonging to the State Transport Undertaking or to petrol tank lorries or such other motor vehicles as the State Government may, by order, exempt.
