I have driven on those roads again since I made this edit.  You are correct, they are signed with G and LL shields.  They didn't used to be.  Some of my information comes from how I remember things years ago, and they didn't used to be signed with shields at all.  They are now, so should be labeled that way on the map.

However, I still think that it's incorrect to call them "CR." The ref should be just "G" and "LL" without the CR in front.

I believe I saw "CR" being used in Washington County recently, but other than that, I don't recall CR being used anywhere I've been in Oklahoma, and you've put it all over the place.  I have a lot of notes from the last year about rural areas between Eufaula and Tulsa, but I haven't made most of those changes because I don't want to undo all of your work without checking with the wider openstreetmap community.  At some point I'm going to bring this up on the forum and get community consensus before changing a lot of your edits, but one of the things I think is wrong is the use of "CR" all over rural Oklahoma.  I really don't think "CR" belongs in area where nobody uses it to describe a road.  It's much more common in other states, but not used much in Oklahoma.