I have only one question about riding on Interstates ...... why?
BTW - Google Maps bike mode will usually not allow you to route via Interstates.
Even if there is no old road, it will send you 47 miles over a mountain on dirt tracks.
YMMV, but I do my very best to avoid Interstates, even where legal in the West.
Those wide shoulders are often littered with tire shreds, wire, glass, etc.
Not to mention the constant road of trafflc.