Judgment of the Court (First Chamber) of 2 October 2001 in Case C-12/02 (reference for a preliminary ruling form the Bayerisches Oberstes Landesgericht): criminal proceedings against Marco Grilli (Free movement of goods — Measures having equivalent effect — Transfer by road to one Member State of a motor vehicle purchased in another Member State — Temporary number plates — Criminal penalty for driving a vehicle without a valid registration)