Vehicle Registration Plates...

As a keen Motorcyclist, and avid watcher of "American Choppers" on the Discovery Channel, I am curious to know how Orange County Choppers manage to get away with test riding their finished Bikes on the public Highway without displaying Vehicle Registration Plates!
Over here, a Dealer, Garage, etc, has to display a special Registration Plate on the unlicensed vehicle before it can be tested/used on the Public Highway.
In the event of an accident, offence, etc, the Authorities need to be able to identify the vehicle by its Registration Plate!
There you go...another question for you...
...!
Paul...Meep-Meep... 8-)...!
Over here, a Dealer, Garage, etc, has to display a special Registration Plate on the unlicensed vehicle before it can be tested/used on the Public Highway.
In the event of an accident, offence, etc, the Authorities need to be able to identify the vehicle by its Registration Plate!
There you go...another question for you...

Paul...Meep-Meep... 8-)...!