Wow, some people here are really idiots without perspective.
Two girls were killed by Carrera, that is not at question. In such situations as the case described I would say, from the information we have, that it is more likely her is guilty than that he is innocent. You have an obligation to adjust your driving to the conditions on the road, and him hitting three stationary cars doesn't look too good for him.
He killed two girls and that is much more important than juventus will ever be. If found guilty he should go to jail, I don't care who he is, and people making this to be a conspiracy against Juve are really idiots. Any person in the same situation would be tried, and rightly so.
As for why it has taken so long, I don't see anything suspicious there. Trials take time. You need to do am investigation, ask for expert opinions (on various things, what the weather was like, whether the car was well maintained and properly functioning, assess brake distances and tracks, etc), you need to schedule a pre hearing, the defense asks for time to gather evidence, you have various documents to submit and reply to, you have to wait for the Court to have a slit in the schedule, etc, etc. And this kind of case is not aa priority case, as Carrera is not being detained. If the person is being detained then you have stricter deadlines for certain things and the prosecutor and Court will give higher priority to cases which concern more serious crimes with intent and where the persons are detained. So criminal cases take time.
If Careers is guilty then lock him up, I hate rich assholes driving recklessly like they own the road (not saying he did that, but if he did).