Green number plate
One of the more recent variants, the green number plates signify that the vehicles run on electric batteries. The plates have white text on the green backdrop and contain the alphanumeric code in the same general format.
Red number plate
Red number plates are rarer to spot. It signifies that the vehicle has a temporary registration. Test drive vehicles in automobile dealerships usually have red number plates. The number is yet to be registered with the Regional Transport Office (RTO), but can be used on public roads for various reasons like transit, demonstration or testing.
Blue number plate
Cars belonging to foreign diplomats, embassies or consulates have a blue number plate. These are provided by the Ministry of Foreign Affairs, and usually carry the alphanumeric code in white. They may also carry the logo or emblem of the diplomat or embassy’s country, and the vehicles are exempt from paying local taxes, tolls or other fees.
Black number plate
Black number plates are rare, but they denote commercial vehicles registered as self-driven rental cars. The use of this coloured plate is strictly reserved for this category.
Red number plate with the emblem of India
Red number plates with the national emblem are typically used for vehicles that are owned and operated by the central government or state governments. The vehicles are meant for the transportation of high-ranking government officials, diplomats, and other dignitaries.
Number plate with upward-pointing arrow
A number plate with an upward-pointing arrow denotes that the vehicle belongs to the armed forces of India, such as the army, air force or navy. These registration plates are issued by the Ministry of Defence and are strictly reserved for use by the members of the armed forces, subject to their own set of rules and regulations.