I guess this is what it has finally come down to. There was no way the interstate system was sustainable and now we have a broken run down system that we can't afford to fix or replace but is needed to keep the wheels of the economy going. The interstate trust fund that was supposed to pay for it (using a growth model) funds less than half and will be out of money completely in a few years, which means not only do we have to fund the current half from the general fund, but we have to get the other half from the general fund as well PLUS new money for replacement and expansion, and the general fund is also woefully under funded. Not exactly a recipe for success.

Study proposes tolling interstate system to pay for reconstruction | McClatchy