I know these aren't necessarily the middle of nowhere, but it's the best I know of for my area.
Model 5/7 in Flintstone, MD from I-68:
https://goo.gl/maps/5jyuMhDecNv9bPFD7
Sentry 3V8H or 7V8 in Burnsville, WV from I-79:
https://goo.gl/maps/raJd1jZTZDQcTmsHA
ACA Screamer in Reynolds Store, VA from US-522 (not an interstate but a major thoroughfare for the area):
https://goo.gl/maps/rSNMyrucnyg3WUq67