New road construction costs on average $1mill per lane mile.(more for concrete, and that lasts around 40-50 years in low traffic situations) So a 4 lane road costs around $4mill per mile. Not including shoulders and median work. Asphalt roads last around 20 years if constructed correctly. (Most are constructed for far lower traffic than they see now, as they are built to old standards) To fix a road isn't cheap either, and will add up to the cost of new construction very quickly.
NC has (as was stated in another comment) the most lane-miles of any state, and a relatively low population. They have to sharge more taxes on each gallon of gas sold to make up for that, if all of their money is coming from gas-taxes. You know all of those "Clickit or ticket" signs you see? Those are ransom notes from the Feds. You will enforce this law, or you get no money for your infrastructure.
I work with one of the top 5 Doctors in the world that do Islet transplantation. This has allowed people with type2 diabetes to live without insulin injections for over 5 years. Now he is working on creating new islets out of the patient's own pancreatic cells. This doesn't need any sort of stem-cells. They are able to regenerate/redifferentiate into new islets under the correct growth factors. He has been able to do this full procedure on dogs and they have been under testing. He is waiting for the FDA to approve this procedure for testing in humans.
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New road construction costs on average $1mill per lane mile.(more for concrete, and that lasts around 40-50 years in low traffic situations) So a 4 lane road costs around $4mill per mile. Not including shoulders and median work. Asphalt roads last around 20 years if constructed correctly. (Most are constructed for far lower traffic than they see now, as they are built to old standards) To fix a road isn't cheap either, and will add up to the cost of new construction very quickly. NC has (as was stated in another comment) the most lane-miles of any state, and a relatively low population. They have to sharge more taxes on each gallon of gas sold to make up for that, if all of their money is coming from gas-taxes. You know all of those "Clickit or ticket" signs you see? Those are ransom notes from the Feds. You will enforce this law, or you get no money for your infrastructure.
I work with one of the top 5 Doctors in the world that do Islet transplantation. This has allowed people with type2 diabetes to live without insulin injections for over 5 years. Now he is working on creating new islets out of the patient's own pancreatic cells. This doesn't need any sort of stem-cells. They are able to regenerate/redifferentiate into new islets under the correct growth factors. He has been able to do this full procedure on dogs and they have been under testing. He is waiting for the FDA to approve this procedure for testing in humans.