Define "traffic tickets". If you mean traffic misdemeanors, they're not expungeable of themselves and as prior criminal convictions they disqualify him for expunement for any other offense.
Otherwise, as the statute indicates (MCL 780.621), he can try to have his record expunged following a five year waiting period. The expungement of his criminal conviction, however, will not change his status as a sex offender if he's subject to registration laws (MCL 780.622). If he was a juvenile at the time of his conviction, and is still subject to registration requirements, he may be able to get that requirement lifted.

