Unless you're really interested in all the pictures of license plates, scroll down to "County coding" to see the mathematically relevant part. Ask yourself: how many license plates can be generating in the scheme used from 1963 to 2008? How many can be generated in the new scheme?
Plus Maths Magazine: Feature Article. A look at what might have happened to a certain large bank -the probabilities of default turned out to be a lot higher than expected!