I looked through this guidance specifically looking for information on traffic offences and extensive parking tickets (I have paid over $3,000 in parking tickets, but that was about 10 years ago). I was looking at the guidance for applications made 31 December, 2012 or later.
If I am reading this correctly, it appears that minor offences are not considered “non-custodial offences” as long as they have a fixed penalty notice (FPN) and you have not been required to attend court (section 3.5.2). The exception to this is if there were multiple fixed penalty notices within the last 12 months, in which case you should wait to apply until you do not have the multiple FPN in the previous 12 months (section 3.5.3). I don't think any of this will be a surprise, as I have read on the board previously that minor offences are generally not a big concern.
Apparently if the offence has been referred to court due to non-payment, or you challenge it and it is upheld by the court, then it’s considered as a conviction (section 3.5.4) – I would imagine as a “non-custodial offence”, in which case you would not meet the good character requirement until after 3 years have passed from the date of the conviction. I went to traffic court a few years back to fight a speeding ticket, and they reduced the ticket but did not throw it out. So I suppose the worst case scenario is that I be considered as having a non-custodial offence. This seems somewhat excessive considering the severity (or lack thereof) of the crime, but if I am reading this correctly then those are the rules whether they’re liked or not. I suppose there may be some discretion on the UKBA’s part in these situations – but I really have no idea.
The part that I found most interesting, however, is section 10.1 – Concealment of Minor Convictions or Charges. “When the applicant has failed to disclose any (including minor) outstanding charge or conviction that would result in refusal of the application caseworkers should normally refuse the application. In such cases, the applicant should be advised that an application for citizenship made within 10 years from the date of the refusal on these grounds would be unlikely to be successful.”
I understand this to mean that if minor offenses which would not affect the refusal of the application were not disclosed, then that would have no bearing on the application. I certainly would not recommend intentionally withholding information, but I personally have no idea how I would go about getting information for the hundreds of parking tickets I have gotten 10+ years ago. I also had a few speeding tickets from over the last 2-15 years which I do not have the details regarding – however I would be absolutely certain to include the details regarding the one I am aware may affect the application (the one that I went to court and had reduced – but was ultimately upheld).