$66 billion a year in use taxes including fuel, excise, and registration.
That’s just the direct revenue. If you want to include externalities, you also have to include economic activity enabled by these investments, and the taxes on those activities.
Just the auto sector alone produces $60 billion of income tax revenue for state and Federal governments.
But that’s not even scratching the surface of total economic activity supported by the national highway infrastructure, or state and local infrastructure, which arguably holds up double digits percentages of GDP. State income taxes rise and fall based on their infrastructure investments.
Even the Big Dig (at $14 billion in cost I assume due to massive fraud) eventually not only pays for itself but is massively profitable from a combination of vehicle cost savings and in future revenue streams from increased economic activity enabled by the new infrastructure and added prime real estate. [1]
A lot of people die or are injured on the highways. Did you also attempt to measure the lives bettered and saved because of those same highways?
An informed discussion balances positives and negatives of any activity, along with the positives and negatives of a proposed substitute.
There’s a reason why infrastructure spending is one of the very few things which garners almost universal support from all political parties.
[1] - https://www.edrgroup.com/library/highways/economic-impact-ce...