re: Widening Highways Never Fixes Traffic. But Darnit, It Did in Texas

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Efficient public transportation that people actually use would solve the problem also

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I agree - to an extent. Culturally, the West and South are just mass transit averse. So "that people actually use" is a huge deal in your argument.

Not every place can have a NYC subway system. The Washington/NVA system is starting to show that it has no clothes on - propped up, subsidized and deferred maintenance may shut entire lines for up to 6 months this year. And that was going to be the gold standard for everyone.

Managing traffic flow with the "combined" ("integrated" - if you will) route, greatly facilitated by smart phones is likely to be the standard model used by Millenials and subsequent generations in 8 to 10 years.

Think of it as bike sharing or ride sharing, but everywhere and with every node. I'm too old to embrace it, but it is exciting to imagine the world operating like that for a century or so.