Highway spending increased by 90% in 2021. This is one of many reasons why car traffic is growing faster than population growth.
Well you already expressed how to solve it. Issue is we have to think of a strong bus service and train service as a proper service rather than a for profit business. We can do it just we won’t.
Montana is around 147k square miles large it costs $1-2 million per track. We could cover every square mile of Montana for $147 billion which is half of the aid we have sent to Israel since it’s existence or 1/10 of our military budget. For $10 billion you can have train tracks every 15 square miles. For perspective there is 73k miles of public road in Montana supposedly.
If we brought all our troops back to the USA and used them as manpower and spent our military budget on infrastructure we could have 7 million miles of track laid in the last 10 years. For perspective we have 4 million miles of road in usa by quick glance.