Em Príncipe Mestiço o Ministério envia carros e aurores para garantir a proteção de Harry.
It was an overcast, murky day. One of the special Ministry of Magic cars, in which Harry had ridden once before, was awaiting them in the front yard when they emerged from the house, pulling on their cloaks. “It’s good Dad can get us these again,” said Ron appreciatively, stretching luxuriously as the car moved smoothly away from the Burrow, Bill and Fleur waving from the kitchen window. He, Harry, Hermione, and Ginny were all sitting in roomy comfort in the wide backseat. “Don’t get used to it, it’s only because of Harry,” said Mr. Weasley over his shoulder. He and Mrs. Weasley were in front with the Ministry driver; the front passenger seat had obligingly stretched into what resembled a two-seater sofa. “He’s been given top-grade security status. And we’ll be joining up with additional security at the Leaky Cauldron too.” (Half-Blood Prince, Chapter 6).
“Ah, Harry!” said Mrs. Weasley loudly, cutting across Fleur’s monologue. “Good, I wanted to explain about the security arrangements for the journey to Hogwarts tomorrow. We’ve got Ministry cars again, and there will be Aurors waiting at the station —”
(Half-Blood Prince, Chapter 7).
Como está escrito, parece que o Ministério tem seus próprios carros, que são modificados com magia.