[redyaris]

I can only speek to my own experiance in Canada, however I suspect the fudemantal legal principals are the same. what you may want to do first is get "disclosure" from the court, prosicuters office, clark of the court... on what facts/charges the state will be presenting at trial. I have defended my self on a trafic ticket with the defence that the charge does not match the facts in the case, and the judge agreed with me. The desision of the judge will be based on what facts are presented at trial, not on who thinks your inocent or not.
If based on the facts, you have a case, then defend yourself. If not, pay the fine and consider it a very expensive driving lesson.