I've taken about 60 trips outside of the US since I received my green card in 1988 - while I have exit and entry dates for most of them, for some of them I no longer have the exit dates, only the US entry stamps, and it is possible that I don't have all US entry stamps... same goes for dates of various traffic citations over the decades, minor things like parking, speeding, unsafe stopping, seatbelts - how do you suggest I enter this information on the N-400 form?
The burden of proof is placed on you. USCIS can deny an application where proof is insufficient. For entry/exit, I would recommend an affidavit from you giving the best possible approximation. The tickets - go back into your driving record at the DMV and see what you can pull from there.