You may have a legitimate argument. However, it sounds like the facts are too close to call re: whether you are likely to win. Depending on the cost of the fine, it may be easier to just pay the ticket and move on.
Unfortunately, it is the word of the officer against your word, and a judge is most likely going to believe the officer. Your best bet is to ask the prosecutor to reduce your charge to a non-reporting violation so the charge will not go on your driving history and cause your insurance premiums to increase.
James L. Yeargan, Jr. is licensed to practice law in the State of Georgia. All information given is based only on Georgia law, and is not directly applicable to any other jurisdictions, states, or districts. Any answer given assumes the person who asked the question holds a Georgia Drivers License, and this license is not a commercial drivers license (CDL). This response, or any response, is not legal advice. This response, or any response, does not create an attorney/client relationship. The response is in the form of legal education and is intended to provide general information. Any state specific concerns should be directed to an attorney who is licensed to practice law in that respective state.