Which is funny because once that's done, that road will have been a US Route, a State Route, and an Interstate in that order. SR 99 was originally part of US R

Which is funny because once that's done, that road will have been a US Route, a State Route, and an Interstate in that order. SR 99 was originally part of US Route 99, but when I-5 was built AASHTO decided to decommission Route 99 since the whole thing paralleled I-5 so closely that it was considered redundant. The states, however, decided to continue to maintain (most of) the road, and it was assigned a number of state highway designations, including SR 99 in the Central Valley (the states, particularly Washington, did give up on a few portions of it, which are now maintained as local roads in various cities). And now they want to make it an Interstate. (Also, speaking of future Interstates, I'm kinda shocked that I-66 was cancelled. They upgraded a bunch of roads to Interstate standards, and they even signed the Cumberland Pkwy. in Kentucky as "Future I-66 Corridor" (you can even see it on Google Street View), only to give up on it.)