Yes your right, there is no legal obligation, but actually the prosecutor can lower your ticket if you simply ask. It will be by their own judgment to let you off or not. Thats why we recommend to take in your driving abstract and try to get the "mercy" so to speak, of the court system.
Sometimes if they see the officer has already lowered the ticket on scene, then the prosecutor might say no, but in some instances the lowered ticket by the officer may not be of any great value, so then the prosecutor might lower it again to the suitable charge and fine.
This is always different for each person, but if you can manage to convince them your ticket is unique, and your driving record is good, then they will be more inclined to help.
If you already have speeding tickets etc., then most likely they wont help you out.
So yea theres no obligation, but its more of a courtesy, and a mercy by the courts.
Thanks for asking and clearing that up
