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).
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).