I am sure I will get my fair share of brickbats for this one but here goes...
Of late I have seen an increase in the number of vehicles with Kannada number plates. This is illegal per the provision of rule-50, sub-rule-2 and proviso-D of Central Motor Vehicle Rules, 1989, which specifically states that letters on vehicle number plate should be in English and numerals in Arabic. The Government of India in a notification (No.SO. 444E dated June 12, 1989) issued under Section-41 (6) of the Motor Vehicle Act , 1988, also made these rules mandatory.
A private vehicle is allowed to move around anywhere in the country and therefore has to have a regn. plate in a script that most people can read quickly in the case of an accident.
Why do people do this? Imagine if a car with a Tamil/Malayalam/Oriya number plate is involved in a hit and run accident. How do we note down the number quickly?
Murali sir had an interesting anecdote. He took a photograph of once such car and showed it to the police. After a few days the police get back and tell him that this belonged to a Qualis and not to the car in the picture.
I think there are better ways to propagate a language than by violating a sensible law.