General Duty cops are generally your best bet for getting out of a fine if you do okay on the "attitude" test - apologising, well mannered etc. Denying it when you know they've got you is almost a guaranteed ticket, but I strongly suggest you don't admit guilt. It's a small line to tread but basically most cops WILL ticket you upon an admission. "Oh I didn't know, but I'll take your word for it I'm very sorry sir" is a good example of how to avoid admitting it but without openly denying it. Traffic cops on the other hand will always give you a ticket if they're able to, your attitude means nothing. Will these guys denying it is the only chance you have. I was stopped recently for "making an illegal U turn" however I was lucky enough to have enough knowledge of the road rules to trap him on a technicality so no ticket. Saying they might still get a ticket in the mail is 99% of the time just their way to walk away whilst trying to keep the high ground. Also, at least in Qld, if for an intercept the Cop starts using his notebook, you can be fairly certain you've escaped the ticket (most times), as the same information they would use for a "street check" also goes on the ticket so most won't double up the work.