Registration plates are specified in multiple combinations of text colour and background colour to distinctively identify different categories of vehicles. [2] Following combinations have been specified: For colour coding no longer in use, refer section Historical colour coding. Discover different types of number plates in India, their meanings, colors, rules, and legal requirements. In India, vehicle registration plate colours have distinct meanings, with white for private vehicles, yellow for commercial ones, blue for diplomatic corps, black for rental cars, and green for ... This article explores the different types of number plates in India, their uses, and significance. What is a Number Plate? A number plate is a metal or plastic plate attached to the front and rear of a vehicle, displaying its unique registration number.