1 - Don't use real licence plates, use only examples from google or other sites
The 1st plate (Red with white ) are of buses, trucks, taxis, etc.
The 2nd plate (Green with white) manufacturer plates for vehicles under testing, dealer-testing, or in some cases test-drive (in most cases test-drive cars are registered to the dealership and thus use black on grey plates; privately owned cars being tested after repairs usually carry dealer-fitted green plates over their black on grey plates) (Wikipedia text)
The 3rd plate (Blue with white) diplomatic use
The 4rd plate (White with red) are of auto school
The 5rd plate (White with black) Privately owned and government-owned cars
and the last plate (Black with gray) are of collector's items
Plate of presidents of chambers, mayors, presidents of legislative assemblies, governors, presidents of courts and others. And this, merco sul plate, the new licence plate of brazil
Sorry the bad english.