The worst case scenario is that the judge will issue a bench warrant for your arrest. This can also happen if you hired an attorney to work out a deal with the prosecutor, and you did not pay the associated fine by the due date.
When you receive a St. Louis speeding ticket, the ticket itself will indicate the court date, time, and place. It will also give you information pertaining to the traffic infraction that you committed, and the amount of the fine involved. One choice would be to simply sign the back of the ticket, and mail in the associated penalty fines. Of course by doing so, you are pleading guilty to the infraction, and the state will then assess points to your permanent driving record.
But if you do not take care of the ticket, and your court hearing on the matter comes and goes, then a warrant will be issued. This means that if you are subsequently pulled over on an unrelated offense while driving (or if a police officer runs your driver’s license), the officer will see that an active warrant is in place, and he/she will likely arrest you on the spot.