AAHH!!! Supervision = yes it's like a "probation" and probably for a term of 6 months, that you do not receive ANY moving violation citation ..... You will have to take the on-line Traffic Schooling (and pass within the time specified), BUT they do let you print off a graduation diploma. LOL
That's if you take a plea ...... A bailiff will probably talk to you just prior to the case being heard and advise you of your choices of plea. That's when you can decide to plead not guilty and state your innocence, OR, to take a plea of guilty and ask his honor for leniency. The bailiff, if he's worked with the judge previously, sometimes can tell you what your chances are either way. If you plead innocent, and the cop happens to be present and gives his evidence of guilt, and you lose, you not only get fined but are assessed court costs on top of everything else. At that point you lose the chance to go on "supervision" and the results go on your record immediately, and that's what the insurance industry picks up. If you take the guilty plea, and get thru the supervision period, AND pass the traffic school, the record is squashed and dies in the court records. This is what you should do UNLESS you can prove your innocence. Like DOC has said, sometimes the officer didn't bring his paperwork, or can't prove his side, OR, doesn't show up for the trial (sometimes happens, and the bailiff will advise you sometimes if the officer is there or not) .... then it's your word against his ..... up to you ....
You also can hire an attorney (they hang out at the court) and sometimes he can argue your case, but for a fee. No guarantee that he can do better then you ..... so ... let the games begin...

At least that's what I have heard with a "normal" speeding ticket, when your previous record is clean. Don't know about the construction zone thingy.
Hopefully someone else can chime in about whether this is still the procedures or not.

Again ..... if you're sentenced for a long stretch ... can I have your car?