[kozzi]

Lane discipline in US is horrid. No way is it going to happen in the near future.

That said, there are a few stretches of highway on the east coast where you can pay to drive (separately barricaded multiple HOV express lanes). These stretches of interstate are well constructed and have the best chance of triple digit speed limits if it's ever going to happen. A pay to "commute faster" type system is the only way IMO. Revenue would be tremendous but they already have commuters paying to drive the speed limit.