Hey, we have the wonderful tollway system in Northern Illinois. Same promise...tolls will be repealed when the bonds are paid off. That was 20 years ago...and they just doubled all tolls (to a minimum of $1) this year!
Still...additional taxes is not the only way to get money for a project. You could pull money from another worthless project (like public art

). Our wonderful governor is very good at this. He managed to find $10 million for stem-cell research even though the legislature voted it down, the state's budget is way in the red, and it really is only a bailout for venture capitalists who realized the research was going nowhere. I'm sure the money got siphoned off of education or roads...it always is.