You need to contact a criminal defense attorney in the area where you were cited. In most states, a traffic citation is a violation, not a criminal offense. A 24 mph over the speed limit conviction will show on your driver history record with the DMV/DOT. Seek local counsel to see if you have any options.
I am trying to give you a general answer to your question. We do not have an attorney-client relationship by this response on the avvo website. I have not been retained to represent you. I am licensed to practice law in Kentucky and in federal court in this state and the Southern District of Indiana. You need to seek legal advice from an attorney licensed to practice in your area..
Sounds like you represented yourself on this ticket. The only recourse is to submit a motion for appropriate relief. It's a motion asking a judge to re-open your case so that a different result may be entered. It can only be filed once, so if you submit a motion and it's denied, that's it. You'd essentially have to argue that had you sought counsel to assist you with this matter, the outcome would have been different.