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Or... just get it erased with deferred adjudication...
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Which is also known as "taking it under advisement".
First thing is to ask the court to dismiss the case. Write them a letter to the court stating that you received a ticket, that you are innocent, but can't possibly comply with the court date and as such you would like the case dismissed. Put a copy of the ticket in the letter. Don't ask for another court date or say anything else other than you believe this matter to be settled. Put the burden on them to contact you or to arrange another court date. Keep a copy of your letter.
If they do contact you with another court date, call the city attorney/prosecuter and explaing that you thought this case was settled and that it should have been dismissed.
If that doesn't work, most courts will give you at least one postponment and sometimes more. Postpone the case as long as you can. During the postponement, look up the motor vehicle laws in your state to see what the preponderance of evidence is for speeding.
It seems to me that if the cop made a mistake on the ticket with the date, he could also make a mistake in singling you out. In other words, if he is sloppy writing his tickets, he might also be sloppy in enforceing the speed limit or justifying the stop. Also, he if he radared the guy in front of you, he can't have radared you. In which case he can't say for certain what speed you were going. If he put 70 in a 55 on the ticket, how would he know you were doing 70 instead of 68 or 69? If you do fight it, those are the questions to ask. Don't admit speeding. If they ask you if were you speeding, just say, "this officer wrote me for doing 70 in a 55, I just want to know how he determined I was going exactly 70, that is what I am being charged with, since he just picks numbers arbitrarily as evidenced by the appearance date, he was obviously confused at the time he wrote this ticket."
The officer would have had to lock his radar on the guy in front of you in order to prove him speeding, without a lock on you he really can't prove what speed you were going.
If the above fails, work out a deal with the local prosecuter and plead guilty to 5 over, which in many cases is no points against your license.