I just reread the discussion and have realised that there are more opposes and alternate suggestions (High-speed roadways) than originally suggested.
It'd probably be a good idea to move it from "Limited-access roads" but I'm not sure what to. "High-speed roadways" is a problem in that some rural lanes in Texas have higher speed limits than interstates (as someone mentions in the discussion). "Freeway and motorway" is problematic because these are just two examples of what these structures are named.
How about something like "High-throughput roadways"?