I think it could help solve congestion as a problem too.
Maybe cars could book their routes, and the road brokers will maximise for #cars/destination instead of allowing people to keep piling in even after the useful capacity is exceeded.
Urban highways solve a political problem. When you have voters that spend a hour or so a day stuck in traffic it's really easy to sell them the idea that a highway will reduce traffic congestion without them having to change anything about their daily routine (ie. take public transport, bicycle, walk)
Since the highway will only reduce traffic congestion for a short time it's something you can sell to the voters again at the next election.
My point was that in most places none of these things you mentioned actually helps reduce congestion except brute force capacity increase by building more or wider roads somewhere.
Sure, there always are some cases where fiddling with lanes, transport types and other relatively cheap means of changes makes traffic better, but in the end simply more roads are needed.
So you want to reduce traffic by making the roads less enjoyable and more expensive to drive on? Not exactly the type of solution I would like be excited about.
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