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I propose taking two lanes from each interstate everywhere in the US and converting them into Mid-Speed Rail (90-120 mph) for longer distances and HSR where it makes sense.
My only issues would be areas with 2 lanes or less in each direction (>4 total), heavy thoroughfares/interchanges (ie where would you put the stations/would station transfers be easy to make/would location make sense), and last mile (often once I travel outside a city where I am going may be 20+ miles away from the highway exit).