Time frame....
PT, you're on the right track. Always carefully consider the question on the form. Does it specify a time frame? Ten years? Five years? Does it mention traffic violations specifically, as in, "Have you had any convictions (other than traffic violations) during the past five years?" Or does it leave that qualifier out, leading to the sometimes less-than-obvious requirement for you to list all items, even parking tickets? (I'm reminded of the movie line...."Convicted? Never convicted.") As the others said, be truthful, consider the question carefully, and in my opinion, if in doubt, err on the side of divulging information, rather than concealing it (see: be truthful). For example, I had a ticket in '99 that I knew would not be on my record because I asked the judge for "deferred adjudication," which basically means don't get any more tickets in the next six months or so and this one will not go on your record. I listed that ticket on my application, because the question clearly asked for any tickets, not just ones on my driving record. A small point, and some would disagree with my decision to list the ticket, but I was confident I did the right thing.
Good luck!