Neither. It's one more lame attempt to "count" all the vehicles on the island. Somehow a list of registered vehicles from the Transport Department, and a list of all the Town Council permits issued doesn't satisfy the anals that are running this.
I could understand if it was a money raising scheme but if that were the case they could charge much more than BZ$10. And they could save money by nixing the big ugly stickers. Mine is in my wallet, ready to show if necessary.