One thing you may want to check out is that I am not sure they can revoke your probation once the probationary term has expired--they usually start the process of revoking a probation prior to expiration of the probationary period. I know we are talking about a minor traffic offense here as opposed to felony probation but it is worth a look if something becomes of it.
Oftentimes if your probation is revoked for such a thing you get a fine and costs on the charge that was the subject of the probation and it ends up going on your driving record if it is not there already.

