I'm unable to determine your question but it's always a good idea to hire legal counsel to contest any tickets.
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I would submit the requested letter explaining the change of address and any facts relevant to the initial citation. Tell them in the letter what you want to happen-- e.g., dismiss the citation, extend any deadline that may have already passed due to delay of mail delivery, reduce the fine, cancel late fees, etc. If their response to your letter is unsatisfactory, you may have right to appeal in court. You may not go to judge before exhausting the administrative remedy. Consulting with attorney. in your area may be a good idea.