You really can't win if the cop shows up. The only chance you have is with a lawyer, but you basically incriminated yourself, when you said you thought it was 65mph. You can file a TBD, then if you lose a Trial de Novo. If the officer was a CHP you have less than a 30% chance of winning, and higher if it's a police or other law enforcement agency. Good luck and try to not get any more tickets within the next year and a half.
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