These offenses are petty in nature. In your case you were caught while violating a rule where the prescribed fine was Rs.500/- and immediately they have pointed out the violation and recovered the amount, gave you a receipt specifically stating violation.
For recovery of that Rs.500/ if Traffic Police wanted to go to court, they have to register a case, file such charge sheet before a competent court, summon you and commence proceedings to hear arguments of both sides and then sentence you or impose fine of Rs.500/-. All these processes and manhours spent by the Police or Court including wastage of manhours cost Rs.10,000/ to Govt. If one wanted to approach to the court, there is no way the accused can establish that there is no violation, and the costs must be recovered from the accused.
You are fortunate as you were caught, fined, and recovered. In other cities, based on CCTV footage, fines imposed are sent through an electronic summons to the owner of that vehicle and data remains permanent in the system and the vehicle will be confiscated, if challans are pending. In this case, every activity is electronic, and the date, time of the violation, vehicle no are readily available, and a data sheet with such vehicle make, a number are registered in that vehicle Registration number.
Under RTI Act, every citizen is entitled to any information through authentic record for a fee of Rs.10/- and designated Public Information officers are bound to provide such information as solicited by citizen. You can get all those copies of rules from Traffic Police under RTI.