Interesting that taxes are tied in that way. Here in the UK (and much of Europe I believe?) all tax goes into a central pot, which is then shared out, to remove the direct relationship.

There are a couple of exceptions like cigarette taxes and I now believe some of the emissions tax all vehicles pay has been ear marked for roads - though I'm not a fan of this (and a cyclist) as it leads to the feeling that car drivers 'own' that road as they 'pay' for it.