Even on the micro level of traffic law, the prosecution can amend the charges prior to trial. The defense always argues against it but in the end the judge always allows it. As for your title question section (a) deals with blowing straight through a stop sign while section (b) deals with the right turn without stopping. You should ask for a trial by declaration first and after you've gone through all the different levels of defense if you still lose ask the judge for traffic school. He retains the power to give it to you even after a trial.
Tickets can always be amended prior to trial. The judge is the person who controls the fines. You can fight this ticket by a TBD, going to trial yourself, or retaining a traffic ticket attorney.
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