I can take the train, and they'll pay for the ticket, but nothing for the registration or accomodation.
On the other hand, if I drive, I get to pocket the difference, and use that to cover my other costs that the university won't pay.
They expect people to pocket the difference from driving to cover other costs. It's stupid. And I'll give my consent to any government that does not deny a man a living wage-Billy Bragg