Problem is that NJ treats all tickets as criminal fines rather than civil debts. What’s worse is that basically all moving violations are technically punishable by 15 days in county jail.
And no, statute of limitations doesn’t apply as the ticket constitutes a charge, and statute of limitations only limits the time the state has to press charges.
NJ has a very bizarre and archaic justice system in a lot of ways. The advantage is that most fines are actually pretty low as compared to CA. No $500 red-light pig camera tickets.