In Texas we have a lot of FM designated roads and RR (Ranch Roads), both of those I've never seen in any other state. My guess is that because the state is so large in area there needed to be more designations than just SH (state highway) and CR (county road).
That road I mentioned, FM1960, has had a section renamed about 6 years ago to Cypress Creek Parkway. It has grown from a little 2 lane country road into six lane plus a turning lane. Farms no longer exist in that area as it is all urban and shopping now.
Thanks for the read, support and great comment,
Sult