Highway patrol here used to run 911 Carrera targas (they could direct traffic standing on the seats- at least that was their excuse), now they use Volvo V70s and MB Cs. Undercover/unmarked cars can be anything- I know for a fact they used to run a couple of Audis. Local force runs VW Polo sedans, Opel Astras and Vectras. Serves them right! Tom