I'm writing a story and I wanted some accuracy on this matter, specifically for the consequences on the person to whom this would happen. Imagine a situation a public person (this will be important later) did, for the sake of fun, speeding with a car on public ways and the warning and fines couldn't be sent to the person who did it, due to lack of identification on car or having fake plates, something as absurd as this. Then, many years later (originally I thought of having the speeding event happening in 2014 and the person coming clean and confessing it in 2019 or 2020, giving this sort of time window), the author of the speeding and driving with an unmarked car comes to the public and confess what they did, not only to the media (it's a public person, a sort of celebrity) but also to the law enforcement agencies which this could apply.
What would realistically happen to this person, legally speaking?
PS: I did not include a country which this sort of event would happen as I'm still deciding where in the story this could happen, so I don't know whether there's an element of the penalty expiring or not.