There is nothing wrong with Challan Qouta. In every big city of the world it is like this. It has two benfits. It generates fund for the city government to run the city management and secondly people remian on thier toes and do not make traffic violations.
Sometime just stand for two to three hours on a road and see how a police officer or constable handles the challans. In the beginning it will look interesting, and then you get bored. Repetition of same exuces, threats, smiles, abuses. It s all in thier days work. They are generally nice people except few bad fish. But this is how in all walks of life. I think they deserve our support.