As used in this act:

    (a) "Conviction" means a judgment entered by a court upon a plea of guilty, guilty but mentally ill, or nolo contendere, or upon a jury verdict or court finding that a defendant is guilty or guilty but mentally ill.

    (b) "Traffic offense" means a violation of the Michigan vehicle code, Act No. 300 of the Public Acts of 1949, being sections 257.1 to 257.923 of the Michigan Compiled Laws, or a local ordinance substantially corresponding to that act, which violation involves the operation of a vehicle and at the time of the violation is a felony or misdemeanor.