"Fully Directional" interchanges will set taxpayers back more than $49 million each.
They won't cost taxpayers a single penny, since the toll company would pay 100% of the construction costs plus pay more than $2 billion to the state upfront for rights fees. $2.3 billion that can be used on other roads instead of spending taxpayer money.
If I recall correctly, a loan from the Federal Government will be used to pay for part of the construction costs. If Cintra-Zachry defaults on this loan, taxpayers from coast to coast will be on the hook for parts of the fully-directional interchanges, bridges, pavement, and so on.
"$2.3 billion that can be used on other roads instead of spending taxpayer money."
That amounts to about 3 1/2 months of revenue for TXDOT. They got it cheap.