At the introduction to our oath ceremony preparations, an IO actually stood in the front of the room and announced to everyone that minor traffic violations were not an issue in terms of the answers we had to provide on the oath letter questions.
If it was a speeding ticket that did not involve drugs, alcohol, or a fine above $500, I don't think it is necessary to bring it up on your oath form. If it makes you feel any better, you can tell them you received a minor traffic ticket. There is every chance that they will ignore the information and just carry on with processing you for the oath ceremony.