To fight a speeding ticket, you must take immediate action and document the circumstances surrounding the ticket immediately as they happen. Your need to be able to present proof of your innocence, as you are presumed guilty in court, and the officer's testimony will almost always be taken over yours if you present no evidence, as the officer is considered an impartial witness with no agenda in the matter. So be proactive, and write down, or if it helps, photograph anything and everything that will prove your innocence. From eyewitness accounts to weather, road and traffic conditions to the location of the officer, many factors can support your cause. In addition, if you feel the radar gun was not right, challenge it by requesting the maintenance records for the gun to see if it was properly serviced, and to see if it was accurate from the distance, it was used. Finally, plead 'Not Guilty" in court and be aware about any alternatives sentences you could be eligible for, such as driving school, in exchange for dropping the ticket.